Media studies are not just about watching movies and calling yourself a film student. There is a vast array of subjects that fall under the umbrella of communication and media studies including journalism and its ethics, the sociological impact of media on populations, theories of cultural imperialism, globalization and glocalization, and even more technical considerations such as how changes in media technology affect the way information is transmitted, received and interpreted. Also included are subjects like film theory, pop culture, and cultural studies.
The study of media in terms of both content and technology is useful for gaining a better understanding of social sciences like sociology and psychology. While it may appear to be a relatively new subject of study, you can find versions of what we now know as media and communication studies in the work of some philsophers like Immanuel Kant and David Hume. Human beings' techniques of communication are unique to their species, so it is little wonder that this subject has such a rich and extensive history. Its name might suggest academic novelty, but it is in fact as old and integral to the study of human beings as philosophy itself.
On a level appropriate for a student seeking college homework help, a useful online tutorial and starting point for your study of the media is offered by MIT's OpenCourseWare and is titled Introduction to Media Studies.