Which one ... Libero vs Setter ?

So its my sophmore year and we don't have a setter. I played libero last year, but a couple people are telling me that I should change to a setter and let the secondary libero become the primary. I;m 5'1" and my sets could use a little work. But I mean I'm willing to put in the extra time to become the best player I can be. So what should I do ?