I jerked off during a school lesson in 6th grade and I think my brain is broken

I know the title sounds like a classic fake Reddit story, and honestly, I wish it was. But this is a 100% real, embarrassing memory that I just need to get off my chest. It was November 2021. I was 12 years old and in 6th grade. The lesson was "Өзін-өзі тану" (Self-Knowledge class, a thing in our schools). It was a boring, quiet class. I don't know what the hell was wrong with my 12-year-old brain, but I was sitting at my desk, and I just... started doing it. Right there. In the middle of the lesson. Nobody noticed (or at least, I hope to God nobody noticed). And to make it even worse, I finished while thinking about a classmate I had a crush on. I hit new boundaries of cringe that day. Looking back at it now as a 17-year-old, I just want to sink through the floor. My hormones were clearly completely out of control. Has anyone else done something this incredibly stupid in school, or is it just me? For context:I was sitting at the very back desk, and to make it even more ridiculous, I actually covered myself with my jacket so nobody would see. I genuinely thought I was a genius and invisible