HOW DO YOU SHOW YOUR GIRLFRIEND THAT YOU CAN GROW UP?

my girlfriend thinks i cannot grow up because all my friends are immature, well most of them have been making 40K+ for the past few years we are all in our mid 20's - so obviously we like to have fun....she gets upset that i do not spend enough time at her house on the weekends because I have stupid sports games to watch on TV that are my teams games like the cowboys/tar heels bball - and i understand where she is coming from...she says i do not have manners when we go out to eat and i usually just there to eat and go, and im willing to change for her but i just need some hints or tips on growing up i need to show her koz im def inlove with her...so any help will doHOW DO YOU SHOW YOUR GIRLFRIEND THAT YOU CAN GROW UP?
let me guess, she is the same age as you + - 1 year... i think she needs to keep in mind that you are still young and want to hang out and have fun. but the most important thing you should do is listen when she talks, let her talk all she wants and look at her when she does. Oh and don't act around her the same way you act around your friendsHOW DO YOU SHOW YOUR GIRLFRIEND THAT YOU CAN GROW UP?
act more mature uhhmm be your age and learn manners( pull in her chair, open the door, dont eat like a pig etc...)