The Difference Between Those Who Write And Those Who Think They Can't Write

It's all about getting it right first time.
Those who write don't mind getting down some crap on the page. They know they're going to rewrite and rewrite and rewrite until they get it, well, right.
Those who think they can't write get frustrated by a blank page. They won't put anything on it until they think it's perfect, and often, that means nothing gets put on the page at all.
To write, you've got to be prepared to write crap first. And you've got to believe that the crap will turn into something better over time.