Whenever im talking to a chick and could have a chance with her I just cannot get her out of my mind. I have been like this for a long time and if any of the girls knew how much I thought about them they would think I was a stalker or something. Its like every second of the day. I think its normal but just wanted to get some comments back.

its normal
i'm thinking about you right now as i type if you catch my drift ;)
Don't worry about it, by the time you get to be 40 or 50, you will have free time to think about whatever you want every forth or fifth second.
They already know we think about them all the time!
The other option is to make a move right when you're feeling it instead of giving it too much time to ferment. That's actually more ideal :)
seems alot of people do it