This is great for new people. So she makes you nervous? Can't find the right words? Cool, just say so. It'll be fine, you can even be kind of beta towards her when you say it (girls don't mind when you get a little insecure around them as long as they like you and you eventually grow comfortable around her).

A girl who is interested in you will be slightly shy herself. If you're hitting it off with a girl tell her that she's really pretty and it's making you kind of shy. It will give her a confidence boost. People LOVE confidence boosts. Imagine an attractive girl started acting kind of dumb around you and just confessed you're really cute and you make her nervous. What do you think would happen to your self-esteem? Your feelings of being a man? Would it even make you hornier? Guess what, it does girls, too! Being wanted is a HUGE turn on when it comes from someone we are interested in. And trust me, hardly ANY guys are willing to do this. We're all trying to act too tough to notice if we don't that we can get closer to women.

The thing is that this is no magic bullet. You still have to overcome your fear somewhat but it will explain to her why you suck at it. You can't just sit there not talking, or try to be the life of the party either. All it really is is a great way to be honest and emotionally intimate with a girl very quickly. You still have to try.