Bf trouble !!!!

Me and my bf come from different backgrounds, his is more family oriented. For example he acts like he cares about me but would drop me in an instant if it means he got to hangout w his big brother and his big brothers friends. Idk if this is normal or if he just doesn’t care about me as much as he used to. It’s just not a good feeling all of a sudden being put second. Is it ok to not be ok w him ditching me or is it normal for him to put me second when it comes to his family? I’m 19 btw. I think he’s a little old to still b looking up to big bro but I’m not close to my siblings so idk how to feel. 🥺 I’m not jealous but it’s just so obvious that I’m not a priority like I used to be.