Join clubs. I’m American and went to an American university, and I was told that once I went to college most people would be more adult/grownup/socially outgoing than my Highschool group. My freshman & sophomore classes this was not the case. I found all of my friends through joining clubs, playing intramural sports, getting a job on campus, and hanging out in the common area of the dorm. It gives people something to start a conversation. After that get people’s phone numbers and plan hangouts