How to convice parents to let me get my septum pierced?

don't do that. I am not against piercings but a septum causes breathing issues and if you are like my guy it can get stuck on things like clothes and stuff. But take into thought people will less likely hire you and look at you poorly and treat you like a punk. don't ruin your life I am sure you are pretty just the way you are plus guys well real ones prefer the natural look. septum also is ugly looking. :) hope this helped you.