How to boost my metabolism as a teen?

For some time I have been eating less than my body needs,so I guess my metabolism really went down =(
I hated the canteen's food and we weren't alowed to have packed lunches so I just had breakfast,then I shared a choc bar with friends(they're all hungry and I didnt want to be mean)and then I had a whole pack of biscuits or a chocolate waffle or something sweet from home,and dinner was light since my parents have light dinners.But then on weekends I ate enough,breakfast,snacks,lunch,dinner loads and loads!!
But I guess my metabolism still slowed down since on the days of the week I didnt eat much(all of my calories still came from sweets and junk) AND I didnt get exercise AT ALL.I never was overweight but I'm heavier than most of my friends(they eat LOADS).How can I jump-start my metabolism and eat like all my friends,with ice-cream,chocolate...I seem to gain weight if I eat like them,now I can bring packed lunch to school but I'm scared I'll gain weight cause my metabolism is slow!

you eat more but in small amounts
like every few hours
and then you exercize in between meals or snacks n

wt mustard seeds they really boost your metabolism and they fill you up so you dont eat so much

chloe...x

drink coffee duh, and work out. both of those things boost your metabolism naturally and easily

good way to boost your metabolism. . . . . Shut the Computer off Go out side and involve your self in some physically active stuff. . .

Make sure you eat breakfast. Eating a healthy breakfast actually boosts your metabolism. Drink green tea, that's supposed to help boost up your metabolism too. And also, make sure you exercise. I run track and cross country for school. It seriously helps. Do any sort of sport. Just be healthy and active.