Two things:
To the guys that say "don't kick in the balls, don't fight dirty, no one will resepct you", maybe you can talk once you get out of highschool. We all know those fights everyone is crowded around in a circle and two pvssies are just trying to slap eachother in the jaw. Rules don't apply there, because most reasons to fight in highschool can be settled without getting phsycial. When I was 16 a guy tried to rob me. Didn't have a weapon. You aren't scared about looking like a pvssy there, you wanna get the fvck out. I was a skinny ass kid and I'm only 5'8 so, yea a couple kicks to the nuts worked wonders. That type of senario is the only type you should fight in.
Also, to anyone that says years of training go out the door when you are in a street fight, hell no. One of my friends has been taking that karate sh*t for years, and I saw him in a fight once. Took the guy out in 10 seconds. If you actually learn the sh*t they teach you, it is helpful. My two pennies is you probably don't have to fight, and if you absolutely must, there are no rules.
Oh, I started lifting years ago, most people don't try stuff with you if you look big. I have friends that are stronger than me, but I train for size so I havn't been in a fight or had any guy wanna fight me for a while.