Oh, that's awesome! I take it since you said used to you gave up on studying it? Mind if I ask why? I used to want to be a marine biologist for all of my teenage years, and really wish I would have stuck with it but gave up since it wasn't a realistic goal for me due to things going on in my personal life.
Leeches would have also been a great choice, since they're blood sucking parasites much like a lot of people on this site :P
It was a long time ago when I was 22 (33 now), I dropped out of college, mostly because it was too expensive for me at the time to keep on going. Would I ever return to study marine biology, probably not but you never know, I'm always intrigued by the new discoveries in that part of science :)