They are perfectly fine people, but I have no desire to become comfortable enough with them that I feel less lonely. That implies some sort of intimacy, where I rely on or confide in them, it's being vulnerable really, and I keep my work life professional and my personal life private.
That's very interesting and I wonder if it is related to your physical fitness? Social interaction and going out does require more from your body and I wonder if this is something you can train for like you train your muscles
I only wish that is true, beyond the one close friend I made. There are gaps in my social skillset and mentality that makes it difficult for me to achieve.