Oh dear, why are you so uncomfortable, the ones you are afraid of are probably intimidated by you. Just find something you have in common and focus on that. Start talking to them about things they like, football or whatever and you might find a common ground instead of focusing on your differences.
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.
Don't pay attention to it, hard as it is. He is trying to get a reaction from you or hurt you and he is succeeding otherwise you would not be asking for help. Don't wait for him to drive past, and if you are there when he does, pretend you didn't see him.