During your undergraduate career get whatever degree you want, just make sure that you take the premed course requirements needed to get into med school, you can find these requirements listed on the admissions website of the med schools you're interested in or you can ask the premed advisor at your college. You will also need to take the MCAT, which is sort of like the SAT to get into college but it has physics, biology, etc. Once you are in med school you are studying to be a physician. Med school takes four years, but after that you have the option to either do a residency in a medical field you're interested in and become a practicing physician or you can get a research appointment and become a laboratory researcher (in whatever research topic you're interested in). Good luck and I think it's awesome that you're in high school and already thinking about the future. Don't forget to have plenty of fun and enjoy college!