If you think I'm crazy, just give it a try. For a week, or even a couple days, write something that's only for you. (And not just in your journal. You weren't going to show that to anyone, anyway). When you come back to your regular writing schedule, you'll be refreshed and hopefully a little less obsessive about the possibility of critique. The more often you sneak away to write just for you, the better sense you'll have of your own unique vision as a writer. And your writing will probably be so much better for it, too--more true, more daring, more exciting. Eventually, you won't be afraid to take chances in the writing that you actually plan to show the world.