I wonder why theres so many votes for introvert and so little comments?
I feel pretty much the same as you Kav, I can psych myself up and get through a social gathering but I get tired/bored/cranky etc pretty quick and would much rather spend some time either on my own or with the misses just chilling out.
E: Although I dont follow this black/white philosophy where you are one or the other, as in all things in life I think there's shades of gray...