you know there was a time when noone thought 1000m or something could be run (i cant remember the proper distance) but there was one guy who thought differently and he actually managed to complete it. Now after people noticed that he did it suddenly many many more people managed to complete the distance. Moral of the story being, if you dont believe you can do something, it simple you will never be able to do it. If you can speak completely fine when you are alone then yes you can get rid of the stuttering cause its only in your mind. You dont have any physical deformities that stop you from speaking properly.