I'm mostly a close-to-the-chest writer, and I write more for myself than for any audience or feedback. Yes, even though I do this for a living. I actually get a minor panic attack just before the release of a book because it strikes me that, yikes, people are going to be reading it now.

I've found that getting real feedback while I'm writing can almost derail me from writing at all. I used to discuss my ideas with my agent, and while she gave me good feedback, they no longer felt like my ideas and I no longer had any interest in the story. Now I go off into my little cave and write something, then when I've thoroughly revised it and have it solid in my own head, I'll send it to my agent.