Here's some advice that I picked up from Celeste Bergin's post yesterday.
"Someone told me once that many bad paintings is a very positive thing! Keep going despite bad painting and eventually, because of sheer tenacity and volume, more and more the bad paintings get replaced with better ones."
And it's true, it's a case of understanding that the bad paintings are all part of the process of creating the better ones. I guess the same is true for lots of things.