Not enough info in your post, OP.
Do you know how to get those As, no matter if you like the class or not?
If you do, just notch up your HS efforts to a college level and you will be just fine. Add some ECs after you figure out your “academic routine”, prep hard for the MCAT in junior year. Not that much more will be required. Do not make more of pretty straight forward process: “Hard work and Med. School acceptance in your pocket”. No genius is required. It is a college after all. But I did not say that it is easy, HARD WORK is a must from day 1.
Any major will do or any combo of major(s)/minor(s). But you better love whatever you will “plunge” into.