One penny thought.....may be that that teacher is having a hard time in their life & just not able to open up at this point in time & it isn't anything to do with you.....but not able to open up to anyone new to them right now. If the teacher is like that with others....maybe just them....otherwise maybe like I said....not in a place to open up to someone new.

It isn't good to be angry with someone who may be having a problem....or feel that it is even you that they are having the problem with.

Friendly people like you find it hard to understand those who aren't that way to people. In my many years of life..I have found many people I have worked with that didn't like coming out of their shell to communicate with anyone....even though they may be teaching class rooms full of students...they can still be very impersonal even in that environment.

Just a penny thought since I haven't seen the teacher or the body language. Try to blow it off.....I am sure that you aren't the problem.
Debbie