Ira Glass, host of This American Life on NPR, points out that most creative people start out trying to produce amazing things in a medium they love. They also start out with a high taste level. Their initial product does not live up to that high taste level, they know it's not good. Most people never get past the point of producing things that don't live up to their own judgement. How do you keep going until what you produce is actually good enough to please even you?
You can watch the whole series of Ira Glass on storytelling here.
Great video that will help you through difficult times.