I see my old self in what you’re saying. I used to be extremely extroverted, spending nearly all my free time socializing, but now I find much more life satisfaction as an introvert. I derive a lasting sense of pleasure and peace from the things I build, especially physical things, while social interactions only created at best a fleeting sense of satisfaction. I also have much more time for reading, contemplation, and enjoying nature.
I get more than enough social time from my partner and a small handful of friends that I see on occasion. I lived quite a full social life, with a huge variety of people and activities, yet surprisingly I don’t find it all that memorable or important in retrospect. It’s a similar feeling to looking back on one of my former careers.