The ideal of college you believed you would experience is only for the extroverts. If you didn’t make the effort to go out and meet people and do things, it’s likely you’ll just be going to class for 4 years.
A lot of kids think when they go to college, a social life just happens, naturally, by proximity. No, college is an excellent time, maybe the easiest time, to really socialize. But you still have to do get out of your dorm. They’re not coming inside to take you away.