<p>I’m also a college sophomore, and it looks to me that your son is just one of those people who doesn’t count playing sports with, doing things with, or hanging around with certain people his friends. Friend is probably a word reserved for those whom he has an actual relationship with – one wherein he self discloses important details and the other party reciprocates (and this is very important/a very close bond for men because they aren’t allowed to express themselves in a public forum as easily).
If his campus is Greek, then that’s also probably a big part of why he feels like he’s not getting much out of his social life. As a member of a very active Panhellenic sorority on campus, my social calendar is booked solid, and many times, those in Greek life aren’t shy to let others know about it. I pay dues for this perk, and I don’t think it’s normal to have a full social calendar should you not be paying for events etc to be organized for your organization.
That being said, it sounds like your answer lies between my two thoughts, at least.
Good luck and take care!</p>