I really think at this point, it's all I can do. Just telling that voice to shut up. In the book on writing by Gail Carson Levine, Writing Magic, she talked about having this voice in her head, too. And considering she wrote my favorite childhood novel Ella Enchanted I'm not taking this as a bad sign. I'm taking it, in a way, as a good sign. That first, I can recognize the weak points in my writing and improve them. And second, that the mean voice isn't always right. It's just being critical at times with no purpose to it.
Do you get this same little voice in your head? What do you do about it?