I'm much less social too.
I used to say I loved parties but the truth was I loved the social sanction to drink as much as I wanted.
Then, when I got sober, being around people drinking really got me resentful.
Those two things made me not a very good party guest (or host as the case may be)
I'm actually a homebody and I'm comfortable with that now. It's me.
But if you like being around people thats great too - but why not do other things that aren't so alcoholically centered?
go to the movies, get involved in team sports, go out for a pizza, even host a small intimate dinner party instead?.
D