I don't think your puzzle can be solved easily, because the new Steam profile layout doesn't list information about date joined. All we know is that you've joined less than a year ago, which means there's 365 dates to check.
Edit: Q8 is wrong, too.
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So here's a puzzle that is all about me. Every single answer may be found on either my Steam Profile, my various forum posts here on Steam Gifts, My SteamRep profile, and my SteamTrades profile. It shouldn't be hard at all, assuming you pay attention.
Here it is.
Good luck!
EDIT: Q8 was a typo. The answer I put in was 12, not 14. I would edit this, but for some reason I wasn't logged in to ItsTooHard when I published the puzzle.
EDIT 2: Thanks to the people who told me about Q8 and how to find the profile creation date
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