I don't know where I fall sometimes myself. I was more extroverted in my childhood and teens. My social circles closed after that. A lot of that had to do with my own conclusions and general wariness with some aspects of the world... I put the "brakes" on in a "Ji" kind of way. I established a better sense of value orientation. For example, ever since I quit doing drugs (about/around after highschool), I had a difficult time ever finding any healthy social niche to mobilize me. People everywhere around me were stepping it up with partying, while I was pulling back. I'd sometimes try to be friendly and give people the benefit of the doubt - only to fall back on my original conclusion. That what they were doing was retarded. I don't want to be around it. Additionally, I thought I could find more sober/sane social circles by going to church... only to find that they pissed me off in other ways. I get lost searching for meaning somewhere.. somewhere to belong.. and I often do it in a passive way. With reading or the net, for example. Lastly, I kind of have hated all of the jobs I've had, so I've jumped around and quit many of those easily, without forming any bonds.