I'm already done with college (well, with a bachelor's degree for now ... though thinking about going to graduate school), so I don't think I'd want to be getting another bachelor's degree in marine biology now, lol. But for you, if you really like it and are about to go to college, why not go for it? It certainly is a very interesting field of study and I'm sure you'd like it very much, especially if you like fishies and tanks

I actually had a friend in college who was studying art but was considering switching to marine biology - she never switched though, lol. She nevertheless thought marine biology to be a very interesting area of study.