What do you do when people make fun of your weight?

Well I have this very same issue but you have to ignore the ignorance people do it to get under your skin to make you feel less than a person. Im14 and I have issues like this all the time but I know how to take control of a situation by ignoring it to my best ability. If push come to shove and it is really agitating you then come up with come backs find their biggest insecurities!