Wheight issue!!?

welll... the thing is i play football baseball and i skateboard and snowboard and no matter what i just keep gaining weight. i eat breakfast at school usually a begal and cream cheese. lunch i usually have a chicken wrap, pizza slice, (meat) sub. whatever they are serving. and dinner i have whatever my mom cooks. usally a mesat vegetbal and a rice or other side dish. i have ban on the computer alot lately since it got too cold to do anything fun. and im awaiting snow! to go snowboard. but even before i spent alot of time on the computer ive ben gaining weight. i remember when i was happy cuz i weighed 100 pounds i was mby 10-11 now im 14 and 165 pounds!!!! im not fat really but i gain weight quik. i also have ben going to the weight room since the start of the year. it douse nothing. help me know what im doing wrong!!!