I'm speaking as a teacher here:
As a teacher, it is IMPOSSIBLE for me to hear and know everything that goes on between my students. I catch what I can and I deal with it immediately. Sometimes they tell me what's going on and I deal with it right away. I spend time trying to teach my students empathy and coping mechs - but they're kids (9 years old) so it's a process. Sometimes when it's the same student doing the same thing over and over that I've asked them not to do? And have taken various approaches to try and curb the behaviour? Sometimes you do just lose some of the patience that you might still be able to show to others... because it wears you down and we have so little time and energy that we can't keep readressing the same thing a million times a day.

Have you ever tried sitting down and talking with one of your teachers about what goes on? At a time when they AREN'T super busy and in the middle of things? If you haven't... try asking one if you could have time to talk to them 1:1.

Then again... sometimes we're a bit blind to the severity of our own actions. I've definitely talked and talked and talked people's ears off and actually thought I was being pretty quiet cause I was TRYING really hard to not talk. Is there any chance that maybe your actions and words have been a bit more severe in the eyes of your teachers?

It really sucks that your peers are like that with you though. Are they otherwise people who act as your friends? Were the pranks you played ones on your friends? If they are.. then maybe try saying that you want to be done with the pranks and cruel words because you're tired of getting into trouble for it?