i have a problem, and its only persctiption is more cowbell!
honestly, dude, do what you enjoy, dont worry terribly much on how it will look, because what you enjoy is what you will do well on. That being said, I sometimes have a problem when people say that they didn't do well in the class because they weren't interested. Now, to get into med school, or to do anything hard in life, you have to go through things you are not interested in. Now if you were just saying this in respect to not wanting to go into Biology, I can see that, but if you were saying that that was why you got an F, I see a problem in that. PS: Is it just me or are all introductory bio labs boring? One lab consisted of looking at how many species of grass were in a 1 meter square. How more boring can it get? At least you get to make cool colors, or make somewhat violent reactions in chemistry lab (not too violent, but you get what I mean).
PPS: I too have thought from switching to a math major, but then I just decided on Neuroscience, my true love.