Isn't that the (pop?) definition of extrovert and introvert, i.e. some recharge when with others, others when alone?

For me that seems to constantly change, that is, when I spent a lot of time alone, people are exciting and refreshing to me, but if I spend many intensive hours with many people, I sometimes actually physically shiver in relief the second that is over: the moment I walk out the door, close the door behind visitors, or put down the phone, I tremble a bit and feel a wave of relaxation wash over me. I like to think that's a sign that my body and mind were looking forward to some alone time, to process things maybe, instead of me being antisocial or socially inept.. but I'm not sure, could be a bit of both.