Please, please, please stop trying to be pleasing to other people. Just relax and be yourself. Performed, goal oriented, behavior at parties is hugely off-putting to me and most people I know (although I don't live in New York, so ymmv).
You may say something that's upsetting to someone, or is brilliantly insightful, or in retrospect obviously silly. So fucking what!? IT'S A PARTY, not a convention. It's this kind of attitude that there is a "right" way to be social that contributes to social anxiety. Fucking stop it!