You must learn to overcome your very natural and appropriate revulsion for your own work.
Yesterday was one of those days where I felt that I couldn't continue because my writing isn't any good. Why waste my time when there are so many great writers that I'm competing with. The answer I keep coming back to is that I can't not write. I'm tried, it would give me so much more free time, but it doesn't work for me. I love words. And stringing words together into poems, pages and manuscripts is what I do every day. Why do you write? What drives you to hit the keys or the pen every day? Today write a paragraph to a page about why you write or if that doesn't work write about friggatriskaidekaphobia. Now get to work.
The Writing Nag