Anyone else become extremely asocial since quitting?

I used to love hanging out with people, drinking usually went along with that, but now I find it all boring. I don't want to hang out with anyone but my gf. The only times I go anywhere, besides work, is when I go to gym or fishing, and both of those things I do alone.

I find it all a chore, like I'm forced to do it so people I'm close with don't start hating me, but I find no enjoyment in it anymore and find it tiresome.

My 30th birthday is coming up and everyone is expecting a big party, but I just want to go eat something with my gf and play video games.

Did this happen to anyone else?