I think there is a book with a similar title, written by Dr. Phil maybe? I can't remember. Anyway, it's true that it can become a very bad habit to say or think negative things to yourself. I believe it becomes a self-fulfilling prophecy, so say good things. Also, something my mother told me: Don't just say, "I want to do better," or something like that. Say, "I will do better," or "I know I can do better."