I can relate so hard to u, i think its the best to be as open and positive about our stutter. Maybe when u start your presentation tell the people you have a stutter. They will now know whats up and you will not be ashamed anymore or less ashamed of your stutter. We have to live with our stutter and not try to focus so much on it. We are special and we are going to get stronger cus of our stutter. Idk if i gave any good tips, im 17 so i don’t have that many life experiences. Have a good day and goodluck with your presentations! I believe in you, you go this!!!