Non stutterer here, have read all of the other comments so I kinda know whats going on. You said that most people there most likely didnt know that you stutter before. Well as the other guy said now they do. People laugh and mock things they dont understand, and I bet that they themselves have something they are often laughed at for. Everyone has something that they are insecure about, even if it might not seem like it. Now you might just say stfu you dont even know what im going through and youd be right. However, I usually comment on posts like this, to say that people dont want to kill you every time you stutter or smth. Just explain them what it is, let them ask stupid questions. They will move past it quickly. If youd like some advice for presentations, dm me and ill gladly help, I have to give a lot of them and people said that I can do it interestingly. Hope i was helpful.