Two different stages?

Brittany 💍
Hey loveliessss. 
So me and my SO have been together for 3.5 years and we're getting ready to graduate college. So I had my party years at the end of hs and into the beginning of college and since he's more of an introvert, I naturally started straying from the partying life and I became more of a Netflix and chill kinda person. I still like to go out and stuff but it's not a must. So now, when we're about to graduate while I'm ready to start the talk about settling down and starting our lives to get her and maybe thinking about marriage, he wants to party.... like right now he's financially struggling yet he's taking the time out tomorrow to go spend the weekend with his cousin to go party... on top of that he has a lot of things he has to do. Obviously, I know we're young and stuff (I'm 21 and he's 22) but it's like damn you wanna go out that bad? He's like I just wanna have fun my last semester of college... honestly Idk why I'm upset but I am for some reason :/ I talked to him about it and I kinda feel like one of those annoying naggy gf's who I never wanted to be..