There are a thousand ways to get involved, or not; hundreds of people to talk to, or not. Whether you're an introvert or extrovert your college experience has or will be affected by the people you come in contact with each day.
What so many may not realize until after they graduate is that the people are the memories you'll take from college. It's not the parties every weekend. It's the all-nighters with friends during finals week, your roommate talking you through a breakup, or the 2 am food run after your intramural broomball game.
Having a support system around you can make the road you're traveling a little smoother, a little clearer.