Tell them the exact truth, every bit of it. If it is only words ignore it and be strong. Focus on your schooling and your real friends or interests. If they get physical, immediately report them, but also prepare to defend your self the best you know how if it keeps escalating and the adults in your life fail you as they often do. However you must try everything beside violence first, and then only if absolutely necessary to protect yourself, hurt them bad. I would write many people or tell your authority figures (parents and school personnel) that if they do not do something about it that you are going to report them to their higher ups also. Hope it all works out for you.
Don't react they build of of that and get proof record it or if its cyber save it or screen shot it show it to your parents or principal if they still do nothing beat them up. At my school kids have to beat the bully up