I'm really confused about whether I should pursue a career as a marine biologist but I'm torn between the desire to make money and do something that I like... is it true that the salary for marine biologist is pretty low? I am doing my 12th grade now in science.. I wish to be an independent woman..

You could make a decent living as a Marine Biologist. Obviously it can depend on where you live and what sort of facility you are working in as to just how much you could expect.
Go for something you are interested in and enjoy. If you haven't already, you may consider volunteering at an aquarium or other marine center if possible. You could even e-mail a few who work in the field and ask for their experiences and suggestions.

Here are a few sites about salary:

Salary Stories: Marine Biologist Salary: Becoming a Marine Biologist

Marine Biologist Salary Range, Marine Biology Salaries - PayScale

What is a Marine Biologist's Salary? - Career.QandAs