I have big relation to what you’ve went through and I am to experience it tomorrow, a painful presentation, the mockery and disgust pointed just as you said. I don’t mean to speak of negativity but we’ll experience humiliation upon humiliation until graduation, remember try advocating for recorded presentation and edit the parts where you stammer severely yeah it’ll look like the your speech jumps from one thing to another but at least it saves time and by the use of technology it’ll mimic presentations of non stutterers. Some teachers are NOT open to recorded presentations which I believe is unfair to the stuttering community. I wish you the best and If your fake friends keep on making fun of you for something you can’t control sooner or later you gotta break it off for advocate for change.