I think you're OK. Your post is well written. Worry is the enemy of creativity. I go through similar times, when I say to myself, "You aren't the writer you think you are, give it up." But being the writer that I am, I always go back to it, good or bad, I write. My problem is finishing, I'm great at starting. In the last week I have gone from query to illustrated animal rhymes to "The Three Bears, The Musical." That's fun, but doesn't get the query done. Who likes writing queries? Anyway, hang in there, ease your mind, there's too much buzzing around in there right now. You'll be fine.