I'm 17 and also a stutterer, it's gotten so bad that, I mostly just sit there during class and listen to the class but I never raise my hand, even when I know the answer. It's really stupid. I absolutely HATE when the teacher says to "go around the room" and say something. I've done a good job of covering it up, but during introductions at the beginning of the year when everyone has to say their name, I once had to have the teacher say my name for me. That was the most embarrassing moment for me.