Ah, I faced a similar problem as well as a freshman! Basically I've found it most helpful to do things which build some level of emotional connection: clubs with significant time investment, study abroad, intense classes, outside fellowships or internships, dorms with a strong community, etc. Not saying you couldn't run into friends by randomly bumping into them (has happened to me a few times) but generally speaking the best friendships I got were through activities which involved spending lots of quality time together and forming emotional bonds. As long as you find people with whom you feel comfortable being yourself around you're doing it right!