Things I don't want to do but have to. Don't I have a choice?

So I won't say any names but somebody is trying to make me sing for something and I don't want to. I really have a few word for this person too but I can't say them. All I'm gonna say is I DO NOT WANT TO SING. Just because I'm in the class doesn't mean I have to sing for people I don't want to. Throwing this mess on me like its hot water. AH AH AH. My life is too busy right now to be dealing with some stuff like this. I'm not comfortable doing it even if they won't see me. I have bad nerves don't mess with me like that. OOH I just wanna hit you in your face that. Pisses me off. Like I said everybody needs to leave me alone. Knock myself in the head and I won't have to deal with it no more.