Yes, this is all very true. What you think you become. I also focus a lot and spend quite some time thinking about how to change my perspective and try to develop an overall positive outlook, which most definately will affect my stutter in a positive sense. This is of course easier said than done, but that doesn't mean you shouldn't try. I remind my self basically every day that I must start meditating, but I always come up with a lame excuse, so I never do it. I have read a bunch of stuff on meditation, and I am convinced that it can be helpful in handling your stutter. It's crazy how we let this "detail" control us and limit us. I want to change, but my way of thinking is so inculcated that it is near to impossible (in my mind anyway). I always act in a typical way in every situation, I fall back in old behaviours, which result in me becoming the person who isn't me.