Yes, isn't it weird?! I spent my early teens not really wanting to socialise that much. Well, just with one or two people. By late teens and into university I used to get upset if I COULDN'T go out and meet loads of people. Was sociable when the kids were small too (think they keep you sociable anyway with all the birthday parties and hobbies etc). Then perimenopause hit and i'm totally back t the way I was in my early teens.
In fact, I think perimenopause has you feeling exactly like a teenager again in lots of ways. Overanxious, paranoid, mood all over the place, feeling like you're not good enough, like you can't cope. Lots of time you just want to be on your own as being with others sounds like hard work. I miss the late teens/early 20s me who never worried about anything but having a good time. Didn't worry about the future, was just happy go lucky. No wonder I liked to go out and meet people, I was open to anything happening instead of just worrying about it all!
But, I have found that I can enjoy things, but in a different way. I much prefer going out for lunch than for dinner, because I'm done and dusted and back home all cosy in the evening and avoiding the craziness of my city on a weekend night. Can't be doing with all that now, even though in my 20s I found it all exciting.
Also, I don't feel like drinking so much, so having lots of drunken revellers in town on a Saturday night acting like idiots just pisses me off.
I do remember some older women at work being like this when I was in my 30s and I couldn't understand it as it would be women I'd really get on with, and who seemed to get on with everyone. I remember a couple of big group parties for reluctant 60th birthday girls! Those particular women tended to always make excuses when there was a group outing suggested. But I get it now!
I'm convinced it's an evolutionary thing. No-one would have ever found a mate if they were too antisocial to even leave the house. There's a natural urge to go out and socialise in your late teens and early 20s, I think.