I’ve felt that frustration before. When I was a sophomore in high school, I had a teacher who LOVED to do popcorn reading. Every time it was my turn to read I would stutter so bad I could barely finish the paragraph and then after, I’d hear other classmates whispering stuff about me and laughing. It takes a lot of confidence to be able to do something like that especially in a school setting, and you should be proud of yourself!! That teacher is an asshole and should be ashamed of putting you down like that. Keep your head up, you’re doing great.