I used to manage faculty at a college. One of my best teachers told me that she couldn’t sleep the night before new classes start. Every time. She had been doing it for years. She had student groupies who would take classes just because she was the teacher. The way you feel is not a good measure for the quality of the work you are providing.

We need a clear definition of “done” so that you know when you have done enough and can move your focus to other things.