What should I do?

My fiance of 5 years is pretty social, but "antisocial" by choice. He just prefers to keep his social circle small, meaning just me his future wife. Like at work he'll socialize with his coworkers daily (talk, joke etc), but wouldn't interact with them after work. We have 2 mutual friends (a couple) which we see once every 2-3 months for a double date.

His family is the exact same, as in not antisocial (they are very easy to talk to) just don't want to interact with people often, so we only visit once every 2-3 months or for some holidays (always just for a dinner 1-2 hours), they'll call us every 2 weeks or so to say hi (less than a minute phone call), but that's about it. My family is the opposite, weekday dinners, restaurants, bbqs, social circles, relatives, friends, daily calls etc. So we were raised very differently and I wanted you guys to help me figure this out as an outside perspective. We all live in the same city.

Things I find odd. If we visit his family a month before Thanksgiving, we won't be comming to thanksgiving (as I said once every 2-3 months), same with Christmas and other major holidays. His parents both have sibilings and they see eachother once a year. His parents won't mix relatives, like they'll have his father's side of the family one day and his mother's side the other day. Despite their families having lots in common (same age, interests etc). They never had any drama to keep things this way, I know this for a fact.

Their families met once during the wedding and never again. He plans on doing the same with our families.

My side of the family is very warm. We are super close, my grandmas were best friends (went on vacations together), stayed at eachother's houses, cooked together, talked on the phone. I have 2 married male cousins and their wives are best friends, they always come as a double couple, the girls go out without their husbands for drinks etc.

I talk to my sister (my best friend) every day. My fiance talks to his brother once a year (again no drama has ever happened). It's so weird to think my sister and his brother will only meet once at the wedding (despite being the same age and have the same interests).

I'm just confused. His parents believe that once you get married there is no place for a social life, friends or relatives. It's just you, your partner and your children. And my fiance thinks the exact same way.

How do I deal with this? I want a nice social life, especially when i have children as I believe it's healthy for them to socialize too.

Like my mom used to be friends with my friend's moms just because us children were friends and they wanted us to socialize (they would take us to the movies or for lunch). His parents have never even met classmate's parents, let alone allow one to become friends with them.

I don't know what to do.