From Anne Lamott:

Every writer you know writes really terrible first drafts, but they keep their butt in the chair. That's the secret of life. That's probably the main difference between you and them. They just do it. They do it by prearrangement with themselves. They do it as a debt of honor. They tell stories that come through them one day at a time, little by little.

. . .

This brings us to [item] number four: everyone is screwed up, broken, clingy and scared, even the people who seem to have it most together. They are much more like you than you would believe, so try not to compare your insides to other people's outsides. It will only make you worse than you already are.