the best way to get rid of a bully is not to put yourself in that situation where your by the bully or dealing with the bullies crap you could tell a trusted adult or principle but if you don't want to try switching your classes to where you don't half to share a class with the person who bullies you,block the person from all the social networking sites,block from your cell apps like mr.number or whoscalls work and for free app,walk with a friend who will also help you stand up to your bullies with you,stand up for yourself and avoid and ignore them as much as you can
The best way to resolve a bullying problem is to inform a trusted adult. Adults in positions of authority can find ways to settle bullying problems without the bully ever knowing how they found out about it.
You may or may not have body- image issues, Sky, but school must deal with bullies! You-and others-need and deserve support at school and at home! Whether or not you have issues with weight/shape (you may still be growing), don't listen to the bullies: they're more insecure than you!