The big change from high school to college is the decrease in structured time. The standard 15 credits = 15 hours a week of class time, likely less than half that of high school. You have to fill that time. There are a million organizations to join. Join something active to meet people, even if it is not your favorite thing. A club that meets twice a semester won’t help.
If you are living on campus, always keep your door open when not sleeping. Open doors invite interaction. Look for a college where students stay around on the weekend.