When was a time when the teacher ruined the subject?

In primary one, I had a terrible teacher. Try to clarify something with her? Get yelled at. And since I cry really easily, I usually hold back crying a little after being yelled at (I’m better at that now, but not back then). My punishment for crying was standing outside the classroom, meaning I missed out on a lot of the material, which led to stress, when led to guess what? even more crying.