When I started college, I was an MCB major, thinking that would look good on my apps to med school. But as time has passed, my thinking has changed, and as a result, so has my major. I started to wonder what I would do if, diety of your choice forbid, I didn't get into medical school. Would I really want to work in a lab for the rest of my life? Did MCB suit my personality and my life goals? The answer, it turns out, is no. I love thinking about science, but not enough to make a living at it. I am far too interested in philosophy, psychology, and other "fuzzy" stuff, and where ever I end up, I want to be helping people directly.
The upshot of this is that you should major in something that you enjoy and that you can see yourself using throughout your life, whether you get into med school or not.
Nanon