I did the same thing though due to my being a stupid teen and not wanting to do what my mum thought was cool, I switched to anthropology and started studying that. Two years ago I realized I was doing something I only had an interest in to learn but not do for the rest of my life. So I got back on track and will be graduating next year with a bs of biology and off to grad school!
Moral of the story: Marine Biology is awesome and always listen to yourself
Bookmarks