Can my angry online message be considered a crime?

I am 12 years old. I might have done something that could be considered serious. At school, people have been bullying me, and I’ve also been cyberbullied on an app called Discord. They have shared images of my private diary. A boy named Bikram has been annoying me for the past week, and I got really angry and said he should be naked in front of another boy. On a Discord server that I’m not in, another boy named Chetan said he would strip me in a contest but couldn’t because I’m fat—and Bikram agreed. So, I responded in a similar way. Now I’ve heard from a friend that what I said could be treated as a serious crime and go to court. What should I do?