A lot of the "friends" I made my freshman year felt that way: temporary. I'd only be friends with people for the semester that I was in the same class as them, and then I was shocked the next semester when thy wanted nothing to do with me. It was the same with everyone. The ties I tried to make to my teachers or to extra curricular things, none of the women I thought I might have something with, none of the people I lived in the dorms with. Never felt like I was laying down foundations for my future, just that we were all kind of dealing with each other as long as we had to. Did so piss poorly my first semester (fuck general classes, just let me get straight to my major) that they threatened to kick me out, was so depressed and disillusioned with everything that I literally didn't do anything my second semester (rarely showed up to class, just hung around my dorm or with my high school friend (i.e. my roommate)) except drinking and partying, ended up flunking out (this still haunts me four years later. I have never seen my father so ashamed of me.), managed to weasel my way back in for a third semester.
Third semester I actually managed to do better than I had the previous two, and for once I was proud of myself. Got my shit together, lived off campus, actually had a girl who was interested in me, but before we could really get to know each other, the guy who let me back in kicked me out again because apparently I hadn't met the conditions he presented me with to keep me there. I was told I needed all C+ grades or above, which I did, but he pulled some "Oh well I forgot you need this high of a GPA too." thing at the last minute. Goodbye everything. Was told I could not re-apply for any University of Wisconsin schools for two years. Wound up going to community college near home from 2009 - 2011, and hated every second of it. Only a few teachers actually seem to give a fuck about what they're doing, and the recent paper budget from last year really took the piss out of a lot of those classes. Managed to slog through a few semesters of general classes, and I graduated with a liberal arts degree, but fuck that.
After a three-semester break spent working at a damn grocery store while living with my parents, I'm going back into the University of WI system in January. Going to see what I can do in the area of computer technology. At this point I'm 23, I don't feel like going there to make friends or get my future wife or whatever the fuck, I just want a degree in a growing field that will get me out of this state.
My point, people in college, is have fun when you can afford to, but don't be a massive fuck up like I was. You want to look back fondly on your college years, they're supposed to be a high point of your life, not a time you remember with a complete disdain for your teenage self for derailing your future so badly. I can't even think about 2008 without cringing in disgust.