That's totally fair, and I'm guessing there some fantastic options in Europe! You definitely don't have to choose one area now, and if you go to an equine-specific school, you'll be able to choose a bunch of intro classes to try different things out.
Using the term "equine studies" is super broad, so there won't be any class that would cover it all. There's everything from nutrition, physiology, performance, business, management, veterinarian, chiropractor, and massage courses in the equine field, and many more. If you can narrow it down to some sort of area (ie, sciences, business, etc.) it may make it easier to choose a school. Think about your end goal, where you'd like to see yourself in a career. For example, if you don't want to be an equine vet, don't take a pre-vet program.
However, don't feel like you need to pick right away or be amazing instantly. I took 2 years of intro courses before picking the direction I wanted to go in, so give yourself time to explore!
This is an overview of the programs offered at Guelph. It might give you an idea of the options under equine studies, and then you can start looking into options closer to you!