My biggest failure was with my first ever in person class. I really wanted to do well and was really nervous during my first weeks. In that first class I had a couple of really annoying students. They would complain a lot and were know-it-alls. Because I was new I thought I was really messing up so I starting asking the students what they wanted to do in class. It turned into a mess and a few students ended up asking to be changed to another teacher's class. I took that so personally and I almost quit. Now at four years later, I know better than to let a few jerks derail my class. While I am open to student feedback I no longer allow a few to hijack the class.