I don't think there's a writer in the world that can't remember having written "an epic tale" when they were young... and, of course, thought it was the most-awesome-super-boss-freaktastic-tale-
ever!!! Then you let other people read it and those other people pick it apart and make you second guess yourself, and then you re-read your most-awesome-super-boss-freaktastic-tale(and possibly edit it some)... The you let other people read it some more and those other people pick it apart some more and you go "Well, crap! Maybe this just SUCKS!"
Nah... dude, you were 12! The fact that you wrote 900 pages at that age says something, at the very least. Anyway, even if, in retrospect, you look back and think "Yeah... the story
did kind of suck;" the thing to remember is that even in the suckiest of sucky stories there's a little golden nugget of imagination and inspiration that can be taken from the whole sucky mess and made into something spectacular later on, yeah?
I can't tell you how many sucky stories I've written and discarded over the years, Dracons, but I can tell you that, every now and again, I still go back and pull bits and pieces from each and every one of those crap-piles, weave them into a new tale or somesuch, and find that it wasn't exactly so sucky after all.
As long as what you write makes
you happy and gives
you a sense of accomplishment and fulfillment, dude, who gives a flyin'-frig-at-a-rolling-donut-on-a-gravel-driveway what anyone else thinks of it?
Did someone say something about Grugg needing lasagne? Is this coffee decaf? Where are my pants?
Write on, Dragon Bacon Dude! Write on!!!