One of the most helpful things I've learned when it comes to anything socially is to just get out of my head. If you're not in your head and not thinking too hard, it really doesn't matter what you say because you're not thinking "Is this cool?", "Was that weird?" etc. Even comes to approaching as well, if you see a pretty girl that you don't talk to and you dwell on it, it will put you in a bad mood, or better yet, will 'fire you up' and the next girl you talk to will be weirded out.