I think you really shouldn't let it affect so much of your life. I am in my university right now and there are numerous presentation. Also I stuttet quite a lot, my professors do ask me first if I am okay with speaking and give me an option to even skip. I just say yes and give my presentation. Don't let it affect it you so much. Just go ahead and do whatever you want to do. People hardly care. Even if they do, let them.