Your post struck a chord in my soul, because I am exactly the same way and it's why I don't form relationships with people in the office. I have two personalities in the office - one in which I'm quite open and friendly, and another which is quite withdrawn. I relate it with being very self conscious and not being entirely comfortable around groups of people that I don't 100% gel with. It's those people that I don't gel with that kind of forces me to withdraw into my self.
So, maybe the same result but different causes.
So, maybe the same result but different causes.