<human>: I have texted, sexted and hooked up with numerous girls before and have been able to walk away with no feelings. It is actually very hard for me to acquire feelings. I am in college and got drunk with a girl I went to high school with and although I found her kinda attractive I guess, I didn't really think much of her other than that. Anyways, after a night of drinking and what not we cuddled in her hammock and just made out & so on- nothing major. Afterward, we went back to my dorm and just made out, cuddled, exchanged hickies and sorta felt each other up practically naked. We didn't have any sex...two days later, as I am typing this, I literally can't stop thinking about her and I don't know why. It's driving me crazy and I don't know what to do. Does sleeping with someone like that release some sort of specific endorphin different than JUST having sex with someone then departing right after? I like the feeling and hate it at the same time. I've been in love once (I think) with a girl I dated for 2 years. I know I am very young but still. Is it just a phase, a stupid crush, or what?

Condense the text into a few key points
<bot>: I slept with a girl I've been sort of friends with since high school, and feel like I caught some feelings of some sort by accident.