I also tend to form a very instinctual impression quite quickly, and almost immediately know whether or not I could be friends with the person.
It's not all black and white, and sometimes I change my mind, but not often. I think I'm pretty open minded and I try not to be too judgmental, but...
I can definitely relate; I usually get quieter in larger groups (unless I am good friends with all of them). I used to think that this was a bad thing but I now realize that although I am often stoic and reserved, people respect my opinion more because it is considered and tend to listen when I...