If you want to get the attention of a girl, you should just start talking to her, when she says 'Hi' you should you should say 'Hi' and compliment her on something, this way they wont feel threatened I think, but still be yourself and do feel under pressure, be happy at all times and in a sort of jokey mood, it works for most people I think and it will work for yous as well.
@Jace, I dont think talking politics is going to grab a girls attention especially if she doesn't agree with your view(s), you should try to talk about what she likes etc, latest movies and latest music, it more or less works most of the time.
@GTA Don
I dont think sex should be on your mind right away when you like someone, first you have to really get to know them, theres lots of good looking girls but with bitchy charachters and personalities, you have to have a good blend of looks and personality.