Who knows, you could be discovered and catapult into the big leagues, in which case, would you sacrifice med school?
Is med school really your life's calling?
Yep, you can't just go to Europe for 2 weeks during med school for shows then Asia the next month. But it doesn't really matter because the vast majority of models are "discovered" in their mid teens, not their mid 20s. Mid 20s is retirement age in the business.