What's going on /adv/? I could really use some help to figure

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What's going on /adv/? I could really use some help to figure out what to do

So long story short i'm in my third year of college, Junior year, and right now i'm majoring in exercise science. To finish my degree I need to take about 15 more classes which isn't too bad it'll be my entire senior year and then one extra semester. Now here's my problem. My end game is to go to grad school to either become a physical therapist or physician's assistant, these are both careers that an undergrad in ex science is great for, especially PT. However I didn't realize that exercise science degree is either meant to be taken to grad school or you become a personal trainer (Which you don't even need a degree for) Now I know I really don't wanna be a trainer, at least not full time, and even If I did I would want to work with athletes not the general public which has all the money. I'm confident I can make it into grad school but i'm really worried i'll end up a trainer. Now I have no school debt right now, and to finish Ex sci i'll only graduate with a little (Less than 10k) however if I were to right now switch my degree to human biology, if I don't get into grad school i'd have more career options, the downside though is I would have to take 27 classes, I would have more debt, and it would take an additional year maybe even 6.
Does anyone have any thoughts or opinions? What would you do? And do I have to be afraid like I am that i'll just end up being a trainer, I mean I guess if I do it's not the end of the world, it's better than stocking shelves or delivering pizza forever