Therapy

So I was severely bullied from elementary to high school. It was a private school so I had 9 people in my grade. 7 of them bullied me everyday. Needless to say I almost took my own life because of them and don't know how to have a functioning healthy relationship with anybody. I have no empathy and just full of anger. My therapist wants me to write them letters 🙄. I kind of just want to tell them off and tell them thanks for fucking me up. Ugh I don't know how to do this