I was asked this questions during my NP interview, "how would you differentiate between an NP, PA, and MD?" My answer that she seemed to like was, PAs and MDs follow the medical model in their studies and practice, and NPs follow the nursing model. To put it very generally, PAs and MDs treat a problem or disease, and an NP treats a person with a problem or a disease. Continue your studies and see where your interests and inherit skills are, the roles are completely different and you should quickly figure out which is for you.