Maybe you know how this goes:
You start out on a new project full of enthusiasm and ideas.
But at the end of a hard day's work, you look over your accomplishments with a growing sense of dismay.
And you become filled with disgust at the terrible gap between what you wanted to do and what you've actually done.
The pain can be profound.
A lot of people never make it past this point. Especially in a world constantly on the lookout for "young talent," the failure of a first (or even second, third, and fourth) attempt can be immensely discouraging.