I don't understand it either. Even more worrying, I don't even find it to be important to my life.
I don't feel the need to "connect" to people. Maybe when I was a child, but something might've happened and then I kind of "flipped a switch" and went into "I don't give a banana" mode...
To "connect", you have to "open up". And I just don't want to do that. Maybe I'm afraid to be hurt, used, manipulated... or maybe I'm so settled in my own old ways, and I no longer know how to connect.
Sorry for hijacking your post, by the way. That's an interesting question and I couldn't resist replying to it.