Have you tried talking to him about your perceptions of his teaching methods? And if that doesn't work, have you tried talking to the studio manager?
It could be that you are just ultra-sensitive. After all, you say twice that you "get the feeling" that he thinks you aren't living up to his standards. Well, ask him about it. Don't guess, ask and clear the air.
Who knows, it could be that you are actually showing more potential than some of his students and so he is pushing you harder.
Or it could be that you are a slower learner and need nurturing, and he really is being critical and disparaging. In that case it is quite possible that you and he would both be happier if you had a different teacher.
You won't know any of this for sure until you talk about it with someone who can actually do something about the situation.