I need help it won’t let me update my game it tells me to update billing information but I don’t have a card I’m 14 years old

Apple ID without a credit card  

Apple ID - If you can‘t choose None when you edit your Apple ID payment information

Then you need to choose None if available in the Payment options or buy & redeem an iTunes gift card.

ASC - Late 2012 Mac mini, macOS 10.14.6; Watch, series 3 cellular, watchOS 5.3; iPad Air 2 & iPhone 8+, iOS 12.4; TV 4th Gen, tvOS 12.4;  HomePods, audioOS 12.4 and Airport Express w/ Airplay 2