First of all do not despair! You have a genuine gift for writing and creation. Do not give up on that!
Secondly:
Where are you looking for fan fiction? There is some amazing stuff out there. I mean yes I agree with you, 90% of it is crap, but 90% of everything is crap. Sturgeon's Law holds in fandom as it does in many other things.
I can help you find some really quality stuff if you want.