If you feel paralyzed while working on a rough draft, think of your work like a maze. Sometimes you have to write down a dead end to discover that this is NOT where the story needs to go. Writing and deleting is better than not writing at all.
Imagine tracing your finger down a maze and coming to the first forking path. If you can glance ahead and see it’s a dead end, no problem. But sometimes the dead end is too long or there are too many branches ahead to know which way to go.
The important thing is to choose and keep moving. Find out what works and doesn’t. You can always go back. What you can never do is finish a maze if you stop at a decision point and wait for the entire solution to come to you.