If your life is miserable dont just sit around and take it all. You have to do something about it. I suggest you do something about it know like-
1.) Go to the police as you say (PHYISICAL ABUSE IS ILLEGAL)
2.)If the teachers are useless tell them that you are being abused and will contact the police (that will get them off thier arses)
3.) Look at other schools around the area.
If you have no one to talk to call or email the samaritians. They are trained in these matters and are superb in dealing with these problems.
the number is- 08457 90 90 90