P.S. There is a nutrition forum where you can "Ask the Expert". Renee, a dietician there, may be able to help you figure out the number of calories you need to maintain or lose weight. There's also advice online though you have to be careful that you're on a reliable site that provides solid, safe information. Also, some are free and some charge a fee---sometimes hidden, sneaky fees---so beware. Here's a site where you can calculate your calorie needs for free: http://www.dietitian.com/calcbody.php They also have a link for Teens & Adolescents that may be helpful to you though I haven't explored it at all. Do things sensibly, CM. No rapid weight loss---just slow & steady, focusing not on "skinny" but on "toned, strong & healthy."
Alright thank you very much and I started today with better eating. I do fencing once a week and PE one hour every day. I noticed you said my height would be a big factor in my weight so I went and measured earlier and I'm 5'11"