Bro you 16th right? I am 25 my elder brother still makes fun of me. I have told that I don’t like it but... bhai toh bhai hai. You have two options either take it like it a ‘Man’ /s or tell them you don’t like it if they do it repeatedly make fun of their insecurities repeatedly . Or don’t talk to them. Also don’t take it so personally bro it’s not that deep I have realised it recently that what others says doesn’t matter so much than what you inflict on yourself. Chill out.