That sounds like not terribly helpful feedback. I hope they're giving you tips as well, or something, because "change your personality" isn't so much what anyone needs to hear.

the constant pressure to be perfect is exhausting.

Ha! Um. Yes. And that's all I'm going to say about that, because this isn't under a filter.

This is my only story about teachers and discipline, but I like it. My sixth grade teacher was a Viking in her spare time. (I expect this was some kind of society; I know they did reinactments somewhere.) Now, my teacher was easy-going. Her Viking alter-ego was not. Some days, the VIking came in to teach instead of the teacher, and we had to behave much better on those days. In retrospect, I'm very impressed with what a good system that was.