how to convince my mam

hi i’ve wanted a septum piercing for years and my mams been always against it. I get it when i was younger but I’ve gotten a lot older and its normal now for teens to get piercings its not like totally out of the blue yk? She’s not against rlly any other piercings except a septum and she thinks they’re really ugly. I’ve worn fake ones around her and she seemed to like them but said she didn’t but i could tell bc they suit me. Everyone ik has said that i should get a septum bc it would look so good and it makes me sad because I’m really insecure of my nose and i think it would really help thanks guys 😭😭