I've tried both that, and also the other way around (drawing for someone else), but the former failed because I am the worst control freak and the latter failed because I lost interest due to not having an emotional interest in the story. Haha. And now it's starting to feel like I have an excuse for everything that actually gets me doing anything - maybe I do have some fear of failure or something.
I've actually been thinking about it a lot lately and I think one of the reasons I'm having problems is because I'm, well, for lack of better word, multi-instrumentalist. I come up with concepts, but I never really come to terms with whether I want it to be a short film, a comic, an animation, a script, a novel, bweaargh.