I'm not sure where else to post this.

Try reducing meal portions and skipping snacks gradually. Drink lots of water (stretches stomach, giving you a "full" sensation)

Swim and aerobics, since running will mess up your knees.

Medically, the most recent successful thing seems to be gastric balloons, which is a preferable alternative to LAGB.

View attached image.

eat them fruits and veggies. especially the ones w/ the satisfying 'crunch'. they has good vitamins and less calories than the other stuff.

and completely skip all sugary drinks like sodas!

Very brave of you!
there are several things you can do.

1. start taking walks. on pavements, with hats against the sun
2. start to eat more vegetables and less pastries and baked stuff
3. you really need to talk to your family. explain that you want to lose weight. they will probably be supportive.
   the reason is that doing it alone is very very hard. especially if your family continues to eat everything they want around you.
4. if they cooperate empty the fridge of everything with high calories...

regrading how calories work. they are basically energy for the body. if you don't use the energy it gets stored in Fatty tissue. hence you continue to gain more weight.
if you have more questions. feel free to ask

Watch what you eat. Above all, junk food will be your biggest problem (no pun intended).
It's much better to eat lots of good fruits, vegetables nuts and whole wheat products than to eat lots of sweet, salty, greasy, and junky foods.

Don't be afraid to move a lot, but be careful not to hurt yourself in the process. I presume that you must not get lots of exercise lately, and so your body won't handle too much too quickly. If you hurt yourself, you won't be able to move, which means no weight loss. Do exercises which aren't likely to cause you any problem, and then you can push yourself.

If you have any snack foods, put them away. Throw away unhealthy snacks, and "hide" food away from sight. If some cookies are at your reach, obviously you won't resist eating some of them, and that isn't good. A good solution is to put them in a hard to reach place, like on top of a high shelf or something similar. If you think of eating snacks, it will be difficult for you to get them, and you might feel guilty about it before reaching them. :P

Of course, if you have a bit of self-control, none of this should be a problem. Mainly, focus on a healthy lifestyle, especially related to what you eat.

I make smoothies myself out of, well, whatever, really. Easier to get everything down, and it's cheap--even Wal-mart has frozen fruits for a couple $ a pound. Drink like a liter or two every day, with kale, blue/straw/blackberries, infant powdered milk formula (seriously yummy,) peanuts, and whatever else is around. Quit drinking soda in high school after someone derisively referred to them as "liquid sugar candy." They had a point.

Seriously, I used to eat fast food a lot. I still do, sometimes. But now, after actually trying to eat healthier, it has improved my mood.

You could try walking at night. Cooler then. Swimming could help you stay active too. To stay motivated, maybe weigh yourself every couple of days. Or get some app that tracks progress of your walks, or your weight, or whatever. Maybe something with achievements! But don't compromise and put off exercise for some other time. There are workout plans online. It will be a slow slog at first, but if you're like me (/have dopamine receptors) you feel better about yourself after not too long.

Find a good, proper dietitian and listen to his/her advice.

I could tell you what I'm doing right now, what I'm eating right now and list all the stuff that works for me but in the end it's on person to person basis.

Just know that it's coming from someone who recently hit a mark of 26kg (57 pounds) lost within 3 months. Everything is possible, luv.

Thank you all for the help! I'm surprised that there wasn't any trolls making fun of my situation. I will try all these things that you guys listed. Thank you guys so much. I'm going to try to get some sleep, but if someone has more to add, feel free too! I will read them in the morning :)

Thank you X 1000000

all you need is a tons of strong will, good luck

Do cardio exercises, they burn calories. You could check out 'Insanity Workout' my friend lost weight with it.

Like people mentioned drop sodas, not only are they not healthy but they've got a lot of calories.
Things you can drink are water, milk and tea (green tea is very good and healthy, but you might not like the taste).

When it comes to fruit berries are probably the best for losing weight. If I remember right from reading articles strawberries, raspberries and blueberries are recommended ones.

Even though you want to lose weight your body still needs food. If you lose weight by starving yourself then it wont take long before all that weight comes back.

Eat several times a day but in small portions. That will prevent you from overeating but also will help you with exercises as eating big meals can lead to fatigue which makes exercising a lot harder.

If you're feeling hungry but you already ate then eat nuts (all are good). They contain protein, fiber and other good stuff. Even though they also contain fat and calories they will help you in losing weight (they have something in them that helps your body manage fat).

Also I'd like to warn you not to over-exercise because then your body will be sore and you'll need to wait for it to get better before you can start exercising again. That can also ruin your will to continue with the whole weight loss thing. Start small then start working out more and more.

1. Remember that progress is more important than the visible result. Progress means not quitting after a day or a week or a month. Keep going even if you do not see the results because they are there and accumulate with time.
2. Do not measure your weight every day, because it will fluctuate due to water intake and many other stuff. Measure once a week or once in two weeks.
3. Start walking every day. Walk for 15 minutes in one direction and then walk back home. Next make it 20 minutes and back. Then when you feel comfortable, make it 30 minutes and so on. Later try walking faster. You should break a sweat 2x before returning home if you are doing it right. But walk every day and whenever you feel like it's for nothing, or that you should stay in and eat something, remember what I said in line 1.
4. Drink only water. No soda, no juice, no milkshakes and similar sugary stuff. This will help a lot in a long term and you will feel better on the inside.
5. Whenever you think you are hungry, drink a small glass of water and wait for 5 minutes. If you are still hungry, eat something. This is because sometimes you need water but your brain confuses it with needing food.
6. Have 3-4 normal meals a day but remove snacks in between the meals. If you feel hungry try drinking a glass of water, and if that does not help, eat a fruit and not a bagel/candy/chips.
7. Do not rush. Allow your body to lose weight in time to avoid getting stretch marks and loose skin. Start with walking and swimming, and when you start feeling better, only then start more serious workouts (running, gym). Swimming is really really really good.
8. If you lack the support in family and they push you to eat something you like but know is not healthy while you are trying to lose weight, remember that you are not staying away from that food forever, but only for a time. Even if that time is years, thinking of it like that will help you to say no.
9. Take photos of yourself on start and every month and keep them labeled with years and months. You will not notice immidiate progress, but in a year just looking at the first photo and the last one will show you how much you've gone forward and will keep you from reversing.
10. You can have a cheat day, that's one day a week when you can eat candy or ice cream or a bagel - but that means one Popsicle, not a 5 kg package of ice cream, or a bagel not a box of them. But if you have ice cream then no bagel that week.
11. Extreme measure - stop eating bread. I would not suggest this if you are just starting, you can try eating less bread for now and see how it goes later.
12. Eat lean meats like chicken and turkey instead of pork and beef.
13. Avoid factory made dressings and sauces. Instead of salad dressing from a bottle use virgin olive oil. Instead of ketchup eat real tomatoes.
14. Do not overdo it. You do not want to end up in hospital for being anorexic. While it's hard to start, sometimes it's harder to slow down once the results are in, so be careful not to continue to starve yourself after you look "normal", but instead keep the weight where you want it

Good luck. Remember, it's hard for everybody. Oh, and when you are active, your bowels work better and you'll start pooping more. That's normal, do not panic.

There's basically 1 big reason why you weigh so much: You! You're eating too much!
Stop filling up your plate so much.
If they keep telling you to have some more wjen you're eating dinner together ignore them or eat somewhere else.
Don't eat snacks when you're bored or watching tv.
Go outside and move. If you're old enough get a part-time job at a store packing or moving stuff. Burn off the calories.

It is "easy" . Eat less (and better )and excercise more.
The first thing you should do is see your doctor (an expert in nutrution is better) so he can explain you what to eat, how to eat and how much to eat.
The other part is go to a good gym were a personal trainer tells u how to start working out (you have to make a lot of cardio)
So all this shit is just.... Talk to the experts, doctor and personal trainer.

Edit: You have to be strong,at first the trainig and eating less would be hard, but if you really want to loose weight , is the only way.

What everyone said, plus: play your fav music and "dance".
Or, even without music, try to have fun with movement. I call this "fake tai-chi."
You could try adding some Pilates (I was bored when I tried it but it's really effective for many.)

I suggest that you should be alone in the room and try the most ridiculous moves you can think of, but not the ones that will hurt you ;D
Try to make those moves a bit slower than your normal movement and focus on the work of your muscles, combine it with some stretching and it should be quite fun.

Also: DDR dance pad could do the trick, but it won't engage all your muscles. Have some water to drink with you. You'll sweat like crazy.

This is some weird advice but it's true, as far as I've tried: use smaller plates, it will trick your brain http://foodpsychology.cornell.edu/outreach/large-plates.html

It's all in our heads in the end, I guess.

Go here https://www.reddit.com/r/Fitness/
I know reddit its famous for being a cirklejerk community, but there are incredible info and advice you can find there.
There are some photo albums of people who loose weight gradually, the advantage here is that they are not from a shady website trying to sell you a miraculous product.
Go to see a nutritionist if you can afford it. Nothing beats professional help.

Have you thought of visiting a dietician? I think s/he will be able to help and support you a lot more than we can.

I was never really into sports, but I always got to a point where I thought I had to do something. It's always average weight to chubby, doing little sports and diet, repeat.
Jogging is the most effective thing I did, obviously you need to get the endurance first. Maybe take a walk each evening for an hour. I know an artist that says he was overweight so he did an 1 hour walk each day and did a diet. Seemed to help him a lot! Read about it here. It's a very nice approach, especially the inside walk.
Considering diet there is one thing that turned out to be very effective for me when I combined it with some "sport". I'd say movement but it sounds off, makes more sense in german, I guess. Anyways. No carbs after 6pm! And have regular meals. Take your time eating, so you don't eat too much. Cook food yourself and only as much as you want to eat or regard as a healthy portion.
I figure you are not in control of what you are eating. My mother always made way too much food, when there was so much to eat every day I ended up eating more, but you gotta just leave your plate as soon as you are replete. I know it sounds easy but it actually isn't. I love eating way too much and I learned to eat what's on the plate, but you have to work on your discipline first. I'd say that this is the first and most important step.

It's very important that you change your lifestyle in such a way that you can stay motivated. If you cut out all the "good" stuff right from the get go, you're far less likely to be able to motivate yourself, instead be willing to treat yourself to something tasty on special occasions (and keep it to special occasions). Getting rid of that extra weight is going to take time.
-As others have said, vegetables are great. Filling, not as much calories, and on top of all that, cheap! Just make sure that you know how to cook them, because poorly cooked vegetables can be disgusting (the most common mistake is overcooking, if your vegetables feel like wet noodles, then they are really overcooked).
-Soda and juice are not filling, but contains a lot of calories. Juice is not "unhealthy", but a glass of orange juice actually contains about as much calories as soda (100ml orange juice contains roughly between 45-50kcal, Coke 42 kcal).
-Learn how to cook. You might be in your lower teens, but it's never too early to learn how to cook. It will give you better control over what you eat, and your parents will appreciate it as well!
-If you're starting to feel a craving for sugar, grab an apple. Apples are relatively sweet (so don't overeat them!), but they are quite filling and as long as you can get a good apple, tasty and cheap! (Back when I was a full-time student, I would sustain myself on apples whenever I was going somewhere, as I was too cheap to buy a proper meal).

Remember that you're trying to eat & live healthy, not just lose weight. If you cut out carbs altogether, you're likely to start feeling tired, grumpy and have problems concentrating.

I think it wasnt already mentioned, but beeing on a diet is VERY difficult to pull off.
So i suggest you put up a plan for the week/month.

1. Put in every meal that you will eat and prepare (that will make it visible to you what you eat and further can be used for shopping (the RIGHT stuff) )
2. Put ALWAYS in a cheat-day each weak on which you should put some stuff that you really like to eat, like pizza or something. why? because it helps. its not positive to eat unhealty stuff, but it will in fact be food for your motivation and brain! BUT dont overdoo it. f.ex.: cheatday: breakfast, muesli with banana, lunch, pizza and apple, dinner, nice bread with some kindof creamcheese and maybe 2 spoons of icecream if you like. Just remember.. that wont be healty.. but it is what it is.. a cheatday!

really like that you stand up for that and got the gutts to seek for help.
btw you should ask your friends to maybe start doing some kind of sport together. best something that is fun like skating, waterfootball/volleyball,.... sport thats not just "running/walking" but has a game will more likely motivate you and keep you on track!

thumbs up and gl for you!

Nice to see someone so young getting interested to be more healthy.

Don't drink soda, try eating vegetables and fruits as much as you can, exercise at least 5-10 minutes a day, like walking, running, stretching, swimming, etc... is your choice, and drink water alone without stuff like flavorings as they tend to have sugar.

You should be encouraged to lose weight as 300lbs is quiet a lot for your age (I'm guessing around 13-15 as early teen years go) and this could lead to more severe issues in the future, also your overweight might be cause of some of your allergies and skin conditions, not sure about asthma though.

Try to make your meals look somewhat like this, and have the alimentary pyramid in mind.

Also surgery doesn't works always besides being dangerous you would might get back to your old weight if you don't change your diet. You need to change your lifestyle to keep losing/keeping your current weight.

Hope you get to do your goal of lowering your fat, and maybe you could teach your family to eat healthy too, you never know!

Well first of all good luck and I wish you the best! It is great to become healthier and it is certainly achievable and probably isn't as hard as you might think! I'll try not to repeat too much of the good advice you have already been given - but I know I have been working on losing weight and I'll try and share a few things I have learned.

Don't worry too much about calories or fad diets - that kind of thing can often make a difference in the short term but can be difficult to maintain and may lead to a cycle of weight loss and weight gain. Concentrate on making gradual and sustainable changes - just little things like drinking water instead of soda will build up and make a big difference.

I have cut down on processed foods which often contain too much sugar and the like and started making my own meals from raw vegetables, etc which has made a huge difference. It doesn't have to be difficult - a simple vegetable stir fry maybe with a little beef can be tasty and easy to prepare. And it means not only am I eating healthier but it has also cut down on me snacking and eating between meals because it makes me think twice when I have to go to more effort than just slamming something in a microwave.

I had to cut out cheese early on to make progress and I found cutting bread out of my diet also made a big difference. I have found lots of alternatives for things and stuff that I can still eat as tasty treats like sweet potato chips. I think eggs can be filling without being fattening and replacing bacon sandwiches for breakfast with omelettes has been good for me. Smoothies are great if you can make your own - store bought stuff may well have added sugar, etc.

Activity also makes a big difference, my problems started because I used to eat a lot when I was younger but I played a lot of sports. When my lifestyle changed and I became less active I carried on eating as much and things got out of hand. But don't think activity means having to go to the gym or play sports. Just start off with little things like walking places where you would have caught the bus and as your health improves you will be able to do more and stuff.

Just keep looking for good ideas for changes that you can make that don't seem too hard and keep making them and try and stick to them and before long you will make great progress and feel a lot better!

Brave of you, good luck

You should visit an endocrinologist. They can guide you better than anonymous people on the net

Burn more calories than you ingest. Or the other way around, consume less calories than you burn daily. Not drastically less, or it will have the opposite effect, do it gradually. A regular daily caloric intake for an adult male is around 2000-2300 kcal.

But, over anything else, consult a professional. Nutritionists, endocrinologists, they'll help you way more than we could.