Stuttering isn't mechanically tied to confidence, so don't worry about that. :) And it's not something you "train away", as if it was the act of speaking you were bad at and needed to improve somehow. You can speak! It's just that you also stutter. As for your particular stutter, you should go see a professional and get it looked at. The takeaway here could be that you needn't think about stuttering and yourself in these ways you've come to think about it. There are other ways you could be thinking.