YES!Marine Biologists use many math/quantitative skills in their studies. But, these skills can be developed with time and practice. Sometimes, math comes "easy" to a person. To another person, that same math seems completely alien. I did not have much high school math (barely any trigonometry) - my school did not offer much beyond the basics. When I got to college, I felt very ill-prepared and worried that I would not be able to do what was required. From my own experience, I have found that I often struggle with the abstract idea of math, and sometimes even have a fear of math, but once I realize how I can use and apply math to a real problem, something clicks for me and then I can use it and it makes sense. A resource math class is often a great start to mastering math. So, the short answer to your question is "yes, you can still become a marine biologist." Study and work hard, and once you master each level of Mathematics, you can look back on it with a sense of accomplishment.