hi, i'm about your age and size. I train mma so you can be sure your getting correct info.
Your best shot is to keep someone like this away from you. here are some tips for fighting some one this much bigger than you. However avoid this fight at all cost. Anyone who thinks your weak for not fighting a kid that big is a ******.
PUSH KICK- a kick with rear or front leg, that's used to separate you from him. Just kick straight in front of you as if you were going to kick and push off a brick wall.
BOB AND WEAVE- keep your eyes open, and duck, then move to the side that he punched from. (do all this in one motion)
this should leave him open for a punch or two.
CIRCLE- move in a circular form towards his weak hand. (not the one he writes with)
STANCE- feet should be about shoulder width apart. Your bad leg should be in front of the other. keep your hands up and as soon as you punch bring your hand right back in front of you face.
LEG KICK- kick the same leg over and over and over as hard as you can, and after every kick back away
UP KICK- if your on your back and he's standing over you, place your strong hand on the ground and puch you torso up. At the same time push up with your leg or legs kick him in the stomach.
STRIKES- (if your boxer you should know some of this) punch for the side of the chin every time.
Throw hooks because you punch harder with them. Throw elbows if your close up. (no upper cuts)
If you ever feel that you could be seriosly hurt go for a nut shot, and dont worry anyone who picks on smaller people cant be that tough. Remember, to aviod this at all cost, theres no piont in getting yourself hurt. Whatever happens let me know.