for me i believe that the main reason for stuttering is that you believe that you're going to stutter at any point, while we are speaking we also speak on the inside, it's like having two voices speak at the same time, like you are casually speaking then your inner voice says: bro how didn't you stutter, you are going to stutter, how tf am i still speaking without stuttering. or while you are stuttering your inner voice says fck it that's it now i look idiot it's over so breifly the main reason for stuttering is your inner voice interruption and orders