This is super obvious but its something that's easy to forget when you go out. When guys go out we try to out do our competition by being well dressed, in better shape, funnier, smoother, etc than every other guy and give it our all to pick up a quality female... The natural instinct when we see a crazy hot girl all dressed up, tanned, and fit is that we want her VERY BADLY but we are nervous (and most guys are scared shitless of them).

The reason why they go out of their way to look so good is because THEY WANT YOU. They're desperately competing against each other so that a cool guy will choose to talk to them over their fellow female rivals. Just remember this and you'll be less nervous to approach, and you'll naturally start qualifying them more.