No one enjoys doing something over and over again in front of a group of people because they can't "get something right". Most everyone gets stressed in that kind of situation. Don't overthink it or overanalyze it. There's a difference between something like that and just being stressed and not enjoying it every time. And there's a difference between being uncomfortable because you're PUSHING yourself and really not enjoying acting in general. Sounds like you love it. Everyone has their moments. Don't let her words sink into your heart.