Writing doesn't have to be your first option. In fact, I'd say that you'd be better off making a stable career for yourself and getting a bit more life experience before you even think about writing professionally. Unlike film, there is no set age for writers to be, and heck, it's far more common to see folks start writing at 40 than it is for a fresh-out-of-college youngster.
I'd say: get yourself a skill that you can work with and use to ply a trade before you think about writing as a career. You've gotta live in the world before you write about it. Even if you want a career related to writing or creativity (journalism, communications, advertising), you can take that road.
WHATEVER YOU DO, THOUGH: DON'T TRY TO BECOME AN ENGLISH TEACHER. The West is flooded with a generation of hipsters that are convinced they're going to become Robin William's character from "Dead Poet Society." That market is well past it's saturation point, and it's not worth risking for a teacher's salary.