Hi, your growth has nothing to do with masturbation because as a matter of fact, your are even meant to grow faster because you hormones were exposed at an early stage. You are just experiencing late growth and development thats all, there is nothing to be scared of
Much of a person's development is due to heredity, and every individual will grow at his/her own rate. It's hard to avoid, but try not to compare yourself with your friends or those you see in videos. Be sure you are living a healthy life by getting enough sleep, eating properly, avoiding tobacco products and illicit drugs. You are certainly getting enough exercise with football.