What are the other people in your class like? Do they bully you, or would they make fun of you if they found out? Talk to the teacher, but then keep it between you and him if you can. I think I'm a little older than you maybe, but at university we have people who are called supervisors when you do a research degree. I could tell that my supervisor is picking up on something and she actually said to me once she noticed I don't look happy. I was stupid because I said everything is fine, and I wish now I hadn't. But, it was just a case of not being comfortable discussing stuff with this person, because she is one of those people who is always happy and will never understand how I feel. She always has a quick solution for everything, at least she thinks so, and does not realise the complexity of this stuff.