How do I overcome my crippling writer's block?

As you guys might have already known, I have been working on a story set in the American Revolution. But the progress has been stalling these days, and I think I know why. Every time I open up my document to work on it, I cringe so hard. The thing that comes to my mind is “what kind of garbage did I just make?” I’m so insecure about what I’m doing, thinking it’s not good enough to be shown to the public. I really miss feeling the drive to work, but the horrible feeling just overwhelms me whenever I try to work.

How can I get over my writer’s block?