When I feel scared of writing I sit down at someone else's computer that's connected to a printer. I open a word document and I type. I don't think, I type whatever the hell wants to come out and I don't stop.
Then I print the document and exit without saving.
That one, physical piece of paper in my hand is just for me. I might use it, I might not. It can be brilliant or it can be nonsense.
It doesn't matter, I'm not scared anymore, I'm fizzing over with happy writer bubbles.