Graphic Design is a huge field. It's not just photoshop and vectors. Graphic Designers like to call their job "visual communication" (doesn't that include photography too?). In that field you learn to pass a message to a certain audience in the most efficient and clear way possible.
It's a very broad discipline that requires you to know a lot of extra skills to be good at. You need to be able to wrap your mind around social issues, cultures, alien vernacular, history and all those things that shapes our world. Then you need to find the proper graphic treatment for the message. That's where skills in photography, drawing, painting, printmaking, collage, doodling, lettering, (and also photoshop, illustrator, indesign, dreamweaver, ...) ect comes in.
That field is essentially whatever you want to make out of it. But you need a desire to communicate.
I majored in that field, and today I design mostly books and other miscellaneous printed materials. I enjoy that tremendously, with the usual frustrations of working for someone else of course.
My point being, don't have a preconceived idea of whatever a certain academic field is. Try it out and see what it's like from the inside. You don't have to stick with it if you don't like it. Things change and you always have the opportunity to change with it. Especially in college. And then in post-grad education. And then in life.