You're right, being positive and not concentrating on your stutter are important facts. But you have to do it naturally, you can't just deny your anger and frustration, you should come to the idea that there's nothing to be ashamed or frustrated about. Sometimes it gets worse and that's ok. Sometimes you want to cry about it and that's ok too. You just have to realize that it doesn't mean much, we all get frustrated, ashamed, we just can't let it control us and stop us from doing things that we want to do. Still, good ideas, hope to hear more ;)