You need to do more than volunteer and shadow with those grades. You need a broader range of experiences, leadership, research, and an obvious passion for clinical work. Even with a good MCAT, with limited extracurricular activities you will be at a supreme disadvantage. If one aspect of your app is lacking (GPA/MCAT/EC/LOR), the other three need to be pretty stellar.
You should probably take a year off, make sure you "Ace" the MCAT, get more experience in a clinical setting, scribe/cna/tech, and get an interesting part-time job somewhere else (service industry/tech/research). If you score highly on the MCAT you might have a shot at DO schools with limited ECs, but if all you have is shadowing, volunteering, and 1 internship then you will be in trouble.