Patricia, though becoming a nurse first could help, it is not necessary for becoming a doctor. Most doctors did not work in the medical field as other health care professionals beforehand, especially because the schooling is so long and arduous to get your medical degree. Instead of becoming a nurse, you could work as an emergency medical scribe, a clinic care coordinator, or as an EMT. As long as you get clinical experience and exposure to the practice of medicine, it doesn't matter too much whether it's from nursing or a different role altogether.
They are entirely different professions. It's certainly been done in rare cases, but they don't have quite as much in common as often portrayed. I think people get the impression there is nothing in nursing school that isn't taught in medical school or that medical school is an elaborate extension of nursing school, neither of which are true.