It's not a "fact of life" You can and should do whatever you can to get out of a poisoned environment and if they involves contacting the police or filing some sort of restraining order for persons under 18, then do it. It's only viewed as a "fact of life" because people don't WANT to do something. They're scared that if they tell the teacher, more people will bully them. People, especially kids, needs to learn that it's okay to tell your teacher shit and the more you do it, the more of a hassle it'll be for that bully. They won't bother you anymore because they don't want to deal with all the flack that comes with it. Kids bully kids because certain ones are bigger than others and it givers them dominance. You strip that away when you call in someone bigger into the equation (teachers, parents, police)
Anyway, bullying is illegal in the states. It falls under harassment and if the other kid touches you, it can be filed as assault. I went to a pretty poor high school and during my last year, they installed cameras. if you feel the need to report an assault or harassment to the police, just ask for the recording from that certain timeframe and place. The quicker you act on it, the quicker you can get out of a situation wherein you're a defenseless victim.