There is a shared interest in the subject matter that often results in new insight for all involved. This is the ideal. However, not all college classes are exciting and not all professors are gifted teachers. It is your responsibility as a learner to accept the fact that some classes or instructors may not be as interesting as you would like. You still need to find your own reasons for doing well.
Motivation is crucial to academic success.
Sit in the front of the room and try to make eye contact. If you try to show an interest in the class, you might find yourself actually taking an interest. Be open-minded, some ideas may be different from yours. Get a good system of taking notes if you don't have one. This will keep you active in class.