Life of a School Kid

You go to your friends class. Everything seems normal until the teachers takes role and does not call your name. She says," Are you in the wrong class?"
You reply, " I don't think so."
She then says, "Ok then can you go to the office and check wher you are supposed to be?"
You agree and then go down to the office. They office says that you should be in Math and not History. She also says that you got in trouble from the teacher and need to talk to the teacher.