I can totally feel you. When the teacher ask me to read infront of the class that embarrassing moment, when there is a viva I can't express myself and every damn time I know the answer, when I have to give presentation in front of my classmates I literally cried the words are not coming out of my mouth I chocked, when I went out to buy things every time there is a 5 second awkward silence. If stammering doesn't exist I will be more blissful,more confident. It is my dream that one day I will overcome it and become what I want.