You should never leave college without connecting with some of your professors. I know in some colleges there are over 200 students in undergraduate courses. However, that doesn't mean you'll never have a chance to be more than just a face in the crowd. Take advantage of office hours and visit your professors if you have any questions or concerns. Get to know your professors and allow them to get to know you as well. This will help you a great deal in the long run when you need recommendation letters and such. The best recommendation letters come from those who truly know you. Keep this in mind when you start the upcoming semester.