Pay special attention to biology in high school. Keep up your grades in all your classes. You'll need that to get into a good veterinary school after high school. And once every week or two, volunteer at a local zoo and/or vet hospital/clinic.
High school with great results in biology and math. then college. you can start as helper in a zoo - as well gain experiences for next venture.
Right now line yourself up to take every math and science course available in your school. Make high grades. Take more online if your school doesn't prepare HS graduates for medical programs. If you are not a top student now, you will have to become one as quickly as possible. Veterinary school is tougher than med school.
Given your age, you need to ace your Biology and Math classes. By the time you start on a bachelors you'll know what to do.
get an education and volunteer at a zoo
log off of EP and go study. you start by becoming smart.
Graduate high school, then college..start applying at Zoo's in your last year of college.