What should i start karate or boxing?

i need to know what i should start. karate or boxing because i just want to be sure that if i get into a fight i know what to do. i mean i have always been a tough and strong guy and nobody at school picks on me. i am 13 , 5%26#039;3 and weight about 120 lbs. so can anyone help me?|||Karate is less damaging to the body. Boxing you will have continued blows to the head. Not safe and it can cause brain damage. With Karate you can use it for much more than just fighting. It is a way of life. I think you will have more oppurtunity to grow.|||You should learn Progressive System of Martial Arts - it is all in one. This way you do not limit your abilities and your self-defense is superior!