Consult not your fears but your hopes and your dreams. Think not about your frustrations but about your unfulfilled potential. Concern yourself not with what you tried and failed in but with what it is still possible for you to do.
And I know I'm supposed to feel guilty for wanting people to buy my books... and books in general? Novels and poetry they belong to the realm of art. How dirty of us to try to hawk art! But after a decade of hand-wringing and apologies I can't quite muster the guilt anymore.