Reconsidering college..?

I'm only 18 and into my second year of college. I'm so tired of being defined by my GPA, what cles I'm taking, or what activities I'm involved in. Right now, I can't even say if what I'm majoring in is what I want to do with the rest of my life. I just feel so lost right now. What should I do? Would it hurt to maybe take a little break from college and see if this is really where I want my life to be headed?