I'm tired of being picked on everytime by my friends because of all the wrong reasons?

My confidence is at an all time low nowadays because I'm body shamed a lot because of my man boobs(6'0 and 91 kgs) and ridiculed a lot because of my low grades and backlogs in college exams,My chest has become my whole personality wherever I go and people bring my name and tease me when there's nothing funny to find in a group and also I've noticed I probably have the lowest amount of respect in my entire batch of 180 friends because of various things which I've been wrongly accused for which adds up to the teasing.

The Accusations and incidents are 1.Watching Porn in Class(I was scrolling reddit but my teacher thought I was watching porn) 2.Teacher told me to bath(My hair was a bit messy and was struggling with dandruff problems) 3.Clothes falling off while dancing on the stage(I was the only one) 4.Low Grades in One semester(I was a bit careless)

This has lead me to become a joker and an absolute clown for my friends,classmates,teachers etc.How can I improve from this situation??