The one thing that has helped me move away from it a bit is starting to art journal.
The person teaching it encouraged us to keep going, even if it wasn't something we had been aiming for. She had us start with random blobs or lines on the paper, and had us smear unused mediums into other pages in the journal. I slowly learned to let go of the perfectionism (at least in my art journal...for a time). It's kinda opened me up to being ok with not being totally perfect in everything I do. I still struggle a lot with it (and the inaction that comes with the struggle), but putting into practice the lessons from the art journal helps.
You don't have to know how to do anything artistic, just experiment. It's in a book, so it's not like you ever have to show it to anyone if you don't want to... there is a certain amount of freedom in that. (And sometimes it's fun to smear paint around).