Original poster-
It's great to see that you are cognizent of the medical pre reqs and the hoops you need to jump through to in order to get to medical school. Knowing what you know now will help you make the right choices.
I'd encourage you to do whatever you want while in college. Remember, the pre reqs are just that - pre reqs. That means that those few courses are the ones that you MUST have to be looked at for med school. You can find various literature on exactly which schools require which courses. The point I'm trying to get to is this...if you aren't great at math or chemistry, you can wait to take those courses until you've gotten used to the college scheme of things, and for goodness sake, don't major in those fields of study just because someone tells you that doctors major in Chem or Bio to get into med school. It's just not true.
Maybe it will help, and maybe it won't, but I wanted to be a doctor before my first year at college, but wound up majoring in a related health field (which I'm currently working in now while I finish up my pre reqs). Now I have no loans from undergrad, and I've been able to do a few "real life" years of living while I decided that I was ready for the commitment to med school. So...do what you want, make sure you take the courses you need, and seek the help from the college's academic support systems when/if you need.
Best of luck!