I'm 14 & 5'3 & weigh 160. But I can't loose weight. What should I do?

I don't feel right with my body. And there are fat jeans that run in the family but i don't want to be fat. so i try to loose weight but i always stay the same weight. Im in athletics. But i just can't loose weight . What can i do to make myself not be fat when i get older??