Goldie- if you truly love being a fish caretaker, perhaps you could still make your dream of being a veterinarian happen. Or, at least very close. You could become a specialist in fish & aquatic medicine. You would still need to be exposed to some furry animals during your schooling(probably, I don't actually know...), but after that, you could live the dream! :)
Also, many veterinarians work to develop products or techniques for treating animals. Some of them don't have to be around animals very much. Or maybe you could be a marine biologist?
Everyone should have the chance to do what they love. :)