I encountered the thought that if you're afraid of showing people your work, that means you care about it, and I think that unlocked something for me. I can't let fear stop me from doing something I care about.
It did unlock something. I've been doodling at least a tiny little bit almost every day, and while it hasn't been enough to really improve at anything, it has been enough to make it feel easy and like one of the Things I Normally Do. And things you normally do are things you can practice.