While a glide year is not necessary, it’s what most successful med school applicants do. It gives you more time to add advanced science courses, good grades, and activities, as well as more time to prepare for the MCAT.
What major are you pursuing?
What’s your 2-year plan?
EMT/CNA is not necessary but can be a medically-related part-time job that pays more than minimum wage. It doesn’t replace shadowing/volunteering but it’s better for your CV (and probably, your wallet) than stacking shelves at a supermarket.