I think there are different types of stutterers as there is a neurological component and a psychological component. I myself, I believe, fall into the same category as yourself where anxiety plays a huge role. I remember in high school that I could practice a speech PERFECTLY at home (like Obama level), but in front of the class, I would COMPLETELY fall apart, with a two minute speech ending up taking five minutes. The good news is that with this type of stuttering you can improve greatly over time because a large component of it is anxiety based. If you consciously make an effort to keep your anxiety level down, you can change the frequency with which you stutter. Personally, for me, exercise, sleep and breathing are the three factors that have helped reduce my stutter greatly, to the point that one of my hobbies these days is learning new languages in a classroom setting. I still haven’t gotten around to trying open mic night with a stand up comedy routine, but it’s still a dream of mine...