Small steps.....Just going is a big step for an introvert! Maybe say hello to someone you are not currently friends with....never know you might spark a good conversation! What's the worst that could happen? That person would say hello back and go on their way! Good luck! :)
This might sound stupid but one or two drinks helps loosen you up and helps you be more confident with talking to people especially if its something you are not used to. Don't make it a habit though or else you can get addicted but on special occasions like this, its okay.
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