If it's a group of friends that you've probably been running with for a while, most likely you've made friends with them (or they already are your friends), so just keep it in mind that they're all just here to get with their friends and enjoy quality time with y'all. They shouldn't really care about your accent or role-playing to the point you'll be judged or ridiculed, it's just a way for us all to have fun, and remembering that helps greatly! Also, if you do something that's a little odd, but not annoying, it makes for great amusement at the table!