What would you think of someone who is always alone?

The person is always on his own. Doesn't initiate conversations. Doesn't try to befriend anyone. Minds his own business. Always busy with whatever he's doing - work, entertainment or anything. In social gatherings he sticks out like a sore thumb. Doesn't have friends.

Updates
+1 y
I just realised that it's all "him", "his" 😂. I meant for both, boys as well as girls.
What would you think of someone who is always alone?
Post Opinion