I posted an identical question a few years back! I don't know if I posted it here (probably) but I posted on MomMD and other sites, there was a PA site I posted on a lot, too. Ultimately I decided to do NP by process of elimination (and I am happy with my choice).
I couldn't apply to PA school without taking the same pre-reqs required to apply to medical school. I figured if I was going to take a year of organic chemistry, a year of inorganic, a year of physics, and a year of calculus, I wouldn't bother applying to PA school, I'd go to medical school! BUT... I couldn't apply to medical school without a bachelor's degree. AND medical school is extremely competitive, I think at the time I read only 10% of people who apply get in.
So one thing lead to another and I decided if I got a Bachelor of Science in Nursing I could at least work in the medical field no matter what happened. I could always take the sciences after nursing school and then apply to medical school. I'm almost done with my BSN now I can say without a doubt nursing school is the hardest thing I've ever done. I have NO desire now to go to medical school if it is as hard as what I am doing now or harder (I can't see how that's possible).
I don't know if any of this is relevant to you. Maybe it is, maybe it isn't. But it's a choice you'll have to make on your own. I will say though if you decide to go to nursing school it will be a good indicator for you if you would survive medical school and may even help you decide. In the end you'll have a BSN and you can work. If you decide you want to go on, you have a bachelor's degree and only need to take the pre-reqs to apply. It's win win. I know a lot of nurses frown upon going through nursing school if you really want to be an MD but in my opinion there aren't many people that will want to go through medical school after surviving nursing school. Those who have been through it will know what I am talking about. GL!