Vets go to college 8 years. The first 4 are studying chemistry, biology, physics & nutrition etc. The second step is 4 more years of Vet training in science including laboratory training, working w/animals, surgery & microscopes. The third step is possible internship of a specialty such as surgery, wild animals etc. Vets continue to take new classes every year to stay in top on latest techniques & info. If this your dream-go for it.
Its 4 years. If you would like to become one talk to a college of your interest to get more info on grades, degrees, etc. also you can make an appt with a vet personally to ask questions about their job to get more clear idea on the field. We're doing that already with our 11yr old, she too is looking into a vet. Regardless what others think of your interests, follow YOUR dream. Good luck :)