Strangely enough, people didn't really comment on it much in my case. It helps that my stutter is somewhat mild/occasional, and that I was already seen as a shy/nervous kid anyway. I can imagine how you feel though. Try digging up some facts and theories about stuttering to help explain to people what's going on. Tell them that stuttering is usually neurological, is something that's totally involuntary, and that even though it usually manifests early in life, sometimes it doesn't show up until later. Your family and closest friends, at the very least, should be able to understand this and support you. Hopefully teachers too (make sure they know what's up, you don't want them to grade you unfairly in oral presentations...) Consider visiting a speech pathologist if they won't believe you, or if you just want advice on how to manage your stutter. Something else to consider, if it really appeared totally out of the blue, is to see a doctor just in case, if you can afford it. Maybe just keep it in mind for your next check-up. It's 99.99% likely you're totally fine, but there *have* been cases of sudden stuttering that were linked to a health problem, so it's good to make sure.