If you find yourself destroying your work and starting something new from scratch again and again, or simply not finishing old things, then you hold some deep belief that is not beneficial. The faster you find it, the better it will be.

Usual culprits are "not working for your happiness but someone else's expectations" or "If it's not the best it shouldn't exist" or basically not allowing yourself to make mistakes, and changing the criteria for success and mistake repeatedly. Too high of a goal or unclear goal or bad priority.