I think I want to become a zoologist (currently in grade 10 and taking biology, which I have a 95 in) or something similar. I know that zoologists study animals and their behaviors and whatnot, but what exactly do they get paid to do? Also, how many years of college do you typically need?

Zoologists most often get PhDs and specialize by the time they finish. So there is a lot of variety in what they do. It might be studies of animals in the wild for universities or animal charities, or rescue efforts, or expeditions to find new species. It might be zookeeping or running an animal sanctuary. It might be teaching, writing, even doing art work. It might be forensic specialties, such as knowing time of death by decomposition and bug larvae. You might be specialized in the oceans, and you need to know about ships and deep sea diving.

It isn't all just knowing animal behavior. You need a lot of physiology, anatomy, chemistry and statistics. You need a thorough knowledge of the scientific method. It helps to be a good writer in case you have to apply for funding.

Of course a few people are so dedicated to some animal or areas of the world that they manage to make a whole career out of this without formal education. But they are usually people with enough money that they don't have to be paid by anyone. Once they get known for what they do, they might start a non profit that can accept donations.