biomedical engineering, like all engineering, needs lots of advanced math and some computer science. Biomedicine or biomedical science doesn't require as much math and computer programming but requires more advanced biology and more knowledge of chemistry.
So if you like advanced math like Calculus, and also physics class then biomedical engineering might be a good fit for you. If you don't like math and instead you like pure biology and chemistry more then biomedicine would be a better fit for you.
An alternative that comes biology and medicine is being a pharmacist. Some colleges have Pharmocology major which combine bio and medicine but are still different than biomedical engineering and biomedicine.
Research on Wikipedia what each field is. What they do, what they research, what it takes to become one. When you find one that sounds the most interesting and matches closely with your strengths then it will help you decide what you want to major in.