YES! Being vet is much more antomy based so of course you must study the animals internals. and Sorry but most Universities will not let you get away with your animal activism because you must learn by means other than A textbook. But yes marine science and more closely, zoology doesnt vocus on the internals, more on ecology or behaviour. You can go in reserch with helping to prevent and save endagered animals (which at the end of the day, saving a sumartian tiger is more benifical for the envionment then saving a breeders inbred puppy, as harsh as it sounds). You can also go into conservation and go right down to the core of saving animals envionments, breeding grounds, protecting from predators (humans as well) you will be REALLY making a difference. It also involves alot of getting into the wild and getting dirty. Im talking about getting rare bat urine on you, or the breathe of a lion in your face, or the water blown from a whales blow hole soaking you. Its real adventure and rewarding. Best of all Zoology isnt as difficult to get into as Vertinary science.
As said before, vet science is HARDER than studying B Surgery as you must MEMORISE NUMROUS BODY SYSTEMS.
The ATAR for my course (B Zool, at UNE) is 72. But you can also study a science bachelor and major in biology, or zoology.
Theres so many options. Dont worry now just enjoy school! I didnt know what I wanted to do until this year, before that I only had ideas.
So dont stress, just know there are PLENTY of choices other than Vet science