Truth about creating things: everything is exactly as good as it can be the moment you make it. The next thing will likely be better because you made the thing that came before.
I've found this to be true of both writing and music. The feeling that it's bad doesn't let up, so I just trust that the people who share it and give me money for it with compliments are being honest. After a million words and hundreds of songs, I'm pretty sure the bad is all in my head.