You have to decide what is extraneous and what is central. There is always more to tell. If you want to have a finished product, at some point you have to say "enough."
I remember a time when I would hear a band and then want to hear everything that sounded like it; I wanted it to feel like I was tapping into a thing, even if it wasn't.
There are times when you don't know yourself. There are times when you don't want to know yourself. There are times when you want to be what you have never allowed yourself to be before.