Medical school admission is very competitive – and all the other applicants will have solid academics, very high grades, very high MCAT scores and medicine-related ECs.
Study an academic field, not “pre-medicine,” to show adcoms that you’ve got the intellectual chops for science and challenging classes. That’s also what will help you do well on the MCATs.
Frankly, there aren’t many jobs for grads with a bachelor’s degree in biology – because it’s the most popular pre-med major, and most students don’t end up going to med school. Many positions in science labs pay little without further schooling, although combine a biology degree with, for example MBA, and suddenly you’re an interesting candidate. With a master’s in biology you could teach in middle/high school.