My family has a HISTORY of bad metabolism.
Remember this, for this is the only time I shall give you good advice.
To speed up your metabolism eat a fist sized piece of food every 2 hours. Make sure its a apple, a orange, a bananna, PBJ on wheat bread, basic food group stuffs. Stay away from "empty foods" such as chips, white bread, cake, pudding, or things with high dairy. Dairy foods take longer to digest in a human body.
Oh, and the entire highschool dating scene. Drop it like those fatty foods in your hand. it is just retarded in highschool.