I'm alone most of the time, but I'm not lonely. Its by choice as I need very little socializing. I used to make an effort to be regularly social, but with the covid lockdowns I realized that I was overall happier with very little socialization. I couldn't come up with any benefit for what it costs me to socialize beyond the little that I actually need.
Hasn't your need for socializing changed over time? It sure has for me.