Here’s the good news: this is not something you have to decide until sometime in your 2nd year of college. As you are planning to take the courses required for med school, you will have to do the Bio / Chem / Organic / Physics run at whatever college you end up at. That will give you a chance to know the topics better- and (importantly) how you like the departments at your specific college. You don’t have to apply with a major to most undergraduate programs, and equally, you can put down ‘Biology’ as a potential major and nobody will ever follow up to see if that’s what you actually do.
Hand on heart, your best path is to get to college, take the intro classes, and follow your interests. If you get there and the Bio prof is a bust but the Physics prof makes the whole subject exciting, take another physics class- and see how it goes. The med school AdComms won’t care at all- but you are not only likely to do better if you are studying things that are genuinely interesting, but you will have a happier 4 years as well.