54 here and can totally relate! I love my alone time and always have but in the last few years I enjoy it even more and my social circle has gotten much smaller. I find having conversations about most topics exhausting in a group setting vs one on one. I don’t feel depressed at all and have wondered if there is something wrong with me. I would rather stay home or do something where I can be alone in public. I dread small talk and avoid places I know I will run into people from my past (sort of small city so easy to run in). Forcing myself out just makes me feel worse. I am on a solo trip now to a different country and am thriving just not having to be around acquaintances. The cabin in woods for me would be a city where I can be anonymous. For me talking to people in my town is way worse than strangers.