I'm coming to the conclusion that "What is wrong with you? and "I'm very angry with you for hitting that note wrong again" are the not the best pedagogical tools...
These seem to be a reason for your nerves.
Not sure I agree. They may be a reason for changing teachers, or having a rather sharp discussion about manners, but not a reason for nerves. OP is, after all, the one paying. She is the one in control, and can leave if she wants. It would be different if she was much younger where parental pressures may be keeping her there.
It is not as easy to leave lessons as you may think.