I am sorry for what happened to you. Kids / Teenagers can be so cruel. It get's better with time. I am 23 years old, stutter since I can remember, and only during school time there there dumb shitty people who made fun. After that nothing happened and all of my stuttering friends hat the same experience. Just don't give up. Talk to your friends, a teacher you can trust. Or go to speech therapy. I helped me to accept my stutter and that makes it easier to deal with dumb people.