I remember! Do you want me to Beta it for you? Why are you not happy with it? Maybe a fresh set of eyes and some suggestions will help?
At least getting the first draft done is good. Also I would suggest leave it alone for a couple of days and read something else. Then go back to it when your own mind is fresh on it again. Sometimes when you proofread or beta your own work you fail to see obvious mistakes. Trust me, I know because i always beta my own work and i have to leave it a whole week before I am capable of a useful proofread!
Finally, dont let the process become a total bummer. Fanfiction is supposed to be FUN. (Get drunk and read it...)