ksecatero21 - If you're registered with your tribe then you would be considered a URM; and since Native Americans are the minority of those that would fall into the same group, it could work out well for you.
I made a similiar post not too long ago because I'm also torn between the two. A few people suggested I shadow more doctors and nurses. It helps to talk to people in both professions!
Something I didn't see mentioned are Pre-Med post bac options after you have your degree. I know Tufts University has one, as well as Johns Hopkins, Goucher, and Columbia. They require a high gpa to get in, but their purpose is to help those with the potential to become a Doctor despite small issues.
Depending on your financial situation, this may be a great choice for you because you could work as a nurse while transitioning.