i feel quite same when i was in new places. i have tried to force myself to go out, to socialise with people stuff even i dont enjoy the late drinking... also try to keep senseless converstaion with people just for get involved in.
now, basically, i just cannot be bothered to do it anymore. i realised people who like you will respect the way you are, people are not in common with you will never become your friends doesnt matter how hard you try. and it always takes time for you to get used to new people and get all your wittyness back, so just take it easy, be yourself, you will make some real friends who appreciate who you are:)