It seems, I have a tendency to speak pretty fast when I'm talking to girls, especially if am trying to think of things to talk about.

for example, today, a two set approached me because i had been quite the jokester/asshole before and then they saw me at a house party and wanted to talk. they just came and sat on my table in ceramics class, yet i started the convo because they were taking too long to say anything and i kept it going by talking lots, with a little bit of response from them. anyways, i moved from topic to topic. i feel like that should have been a situation where they should've felt the pressure, not me.

how do i make them feel that pressure and still maintain my awesomeness? that's only one example but i have a lengthy history of this type of behavior.

First off, kid, are you 14 years old? Seriously though, slow down your speech. Fast speech conveys insecurity in your words. A man that speaks slowly, deliberately, and comfortably loudly, is a man with important things to say; and women want to listen. You'll convey a higher level of alpha by slowing down when you speak.