I recommend connecting with a few different people to get a nice understanding of the options for you. I volunteered at two shelters and shadowed those veterinarians (& asked them lots of questions) as well as helped out at two small animal veterinary clinics and at a goat farm that was owned by a vet to understand more about the variety of career opportunities. Your local zoo may be a nice option, and I encourage studying abroad if you have the opportunity. I studied with wildlife veterinarians and biologists in South Africa and gained both domestic and wildlife experience there as well as a great adventure and lifelong connections abroad.
A great first step is to start volunteering at a local veterinarian office. This is a good way to see what the job is really like and also get some real world experience while making contacts that could later become professional references.
You should also focus on math and science courses as you will major in these in college. If you can take college prep or AP courses, this will also help prepare you well for college. As you think about college, you will want to look for schools with strong science programs.