I used to have that problem. I had many instances of it. But, I was smart. Rather than proceeding to be an ass, or getting into a scuffle, or even running, I made allies. The teachers were my allies; my bodyguards even. At the end of the day, I was at the far end of my school; a 5 minute walk to the entrance. There were some seniors doing swirlies, and I was on the hit list. So, for some time, I kept up a friendly atmosphere with my final teacher of the day, and he, in return, pretty much escorted me to the entrance each day. Entire freshman year, those seniors tried, and every day, they failed because I was one step ahead.
Second year of high school was quiet. I would do my work, hang out at the lockers playing hackey sack during lunch, and quietly leaving school. Hell, I was voted most likely to go nuts and hurt someone cause I was so quiet.
Senior year, I hid in the Guidance Counselor's office for some time, cause my art teacher was tyrannical. Matter of fact, I was more of a counselor's assistant instead of an art student.
I kept my weaknesses, but gained many more strengths.