So I'm 13 and 5ft 4" and weigh 112 pounds. My bmi is normal but I'm over the average weight for my age. All of my friends are a lot smaller that me and I would love to be a little skinnier. I am quite active such as going on runs, bike rides etc as well as doing a few sports clubs and joining teams at school I used to do gymnastics but quit a year ago and since then I've gained around 15 pounds. My mum and nan always tell me how when they were my age they weighed around 25 pounds less than what I do and I don't know what to do. Any suggestions?!?