Up until I got married in 2006, I was a loner. I did similar things people have described here. I liked TV, internet surfing, anime, eating dinner alone, music (j-pop I hate most American stuff), and working on some projects just to do it.

But the urge to be around other people was always there. So I found a wife and got married. I have a kid now and I am much happier than before, but I tend to find myself wanting to be the loner again. Fortunately she goes to bed early and I am a night owl so I stay up until 1AM or so doing the loner thing.