Suing is the pusillanimous individual way.
They won't learn stuff. It sounds like you live in a rich kid neighborhood, only their parents will suffer.
Plus I seriously doubt court will take school bullying that seriously. Unless it's been a chain of beating up, no.
My advice is to have a bunch of hefty friends around you. Don't wear baggy clothes, and don't provoke them.
If they provoke you first, made a witty remark and RUN THE forget OUT OF THERRREEEEEE
Then hide behind a bush or something and stealth around until you can get back with your buddies.