You Should be Writing!
Do you suffer from Writer's Paralysis? Are you sitting at your laptop, fingers hovering over the keys, knowing that whatever you write will not be good enough? That someplace, someone negative is waiting to remind you of that fact? I've certainly experienced this syndrome. In my case, I'm sure it stems from being first born with a side of perfectionism thrown in for good measure.
There's only one cure: WRITE!
Remind yourself that it's only a first draft. Anything goes. Just get it down. It's easier to polish something that's on the screen than something that's still bouncing around in your head.
First drafts don't count. With any luck at all, no one else will ever see them.
You're a writer, write on! You can do it!