I read this quote today, and maybe it'll help you?

"First you have to know and understand intellectually what you want to do-- then you have to sleep-walk a little to reach it. The real obstacle is oneself. I believe that artists are composed of vanity, indolence and self-regard. Work-blocks are caused by the swelling-up of the ego on one or all of these fronts. You get a bit scared about the imaginary importance of what you are doing! Mirror-worship. My solution would be to a slap a poultice on the inflamed parts-- tell your ego to go to hell and not make a misery of what should be esesntially joy, fun."

Along those lines, magical24 has good advice-- write for yourself. And the moment you start to think your story is stupid, just... ignore those thoughts and keep on writing. That's what I do. It's a matter of determination. And rereading your favorite passages, or imagining what scenes you're *really* looking forward to writing helps. :)