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That's a big difference at that age. 8 years is almost half of the time she's been alive.

"only 8 years"

She already told you no. What else do you want? Being in denial and thinking that she said no because she's "too young" makes you look desperate.

her answer is obvious, There is no secret code to figure out in this situation ya have here, she just isn't interested in ya anymore

You are rationalizing your rejection, i.e. looking really hard for reasons why. Even asking perfect strangers online for love advice.
Why, yes, you do sound desperate.

Dude, I don't care about the age difference. But all the other signs point towards obsession and one-itis.
From one creep to another, for your own good (and hers) be like Elsa. Let it go.