Until you have completed your pre-req coursework, prepping for the MCAT is pretty pointless.
RE: a bio degree. You should go talk with the career office at your college. They can suggest some alternative careers with bio degree.
Also consider other health profession careers. Here’s a good resource to get you started:
http://explorehealthcareers.org/en/home
If you have a strong aptitude for mathematics, biostatistics is a very hot field right now. (Requires a MPH or MS degree as entry level degree.)