his sex game is whack.

I've been sexually active with my SO for over a year now , pretty much since we got together last year. And his sex game is awful he can never seem to make me cum! It's not like he has a small penis either. He literally takes like 2-3 minutes during sex too , I mean how do I even say this to him? Like at first I thought I could deal with it but now it's just getting to me in a way, it's like it's all for him sorta thing like we only have sex when he wants it and when he finishes it stops , it's just annoying me now.. How can I go about this ? I mean he's had sexual partners before me and I didn't before him, is he just bad at it or ?