Don't get so caught up with shadowing. Med schools want evidence that you've examined medicine as a career, but they don't look for x amount of hours spent shadowing. By all means, read about the profession, get a job in healthcare and interact with patients (especially the "underserved;" a challenging group, to say the least). Shadowing is a nice complement, but it cannot give you the complete picture.
Many programs recognize the difficulty in obtaining shadowing experiences, especially if you have no family relationships with doctors or other connections. If they required shadowing, it would effectively prevent most low socioeconomic status or first generation in medicine applicants from gaining acceptance.
I have exactly zero formal hours shadowing and out of three interviews, I have gotten two acceptances so far, one of which was my top choice.