what do you mean by you would slightly hurt him physically out of nowhere? Have you tried laughing also? It might help if you act like it's no big deal. It sounds like these people are very inmature, but I don't think they are laughing at you, as much as they are laughing at something you did. Just don't let it get to you too much. Everyone does things we regret, so next time people laugh, just try to think to yourself that they aren't perfect either. So who cares about them? If people don't want to accept you then it's their lost, not yours. But, I would try laughing with them, if they ask you why you are laughing, tell them because you think it's funny also. Eventually they would most likely get tired of it, or just think that your response to their laughter is annoying, so they will stop.