My Future Job

In the future I would like to be a marine-biologist. I have always loved dolphins, piranhas and whales, but the shark is my absolute favourite. In college the subjects I will take are Biology, Maths, Chemistry, and Computer. At home I should watch informative documentaries on marine mammals and fish and go fishing and study the fish I catch. I should also read books and ask my parents if I could meet a marine-biologist and ask them some questions about how they became to be a marine-biologist. The main reason why I want to be a marine-biologist is because I am really interested about the sea and its animals and plants and just want to learn a lot more about them.

What animal or creature in the ocean do you think I should focus on most?