What's a way to decide whether I want to be a nurse or a pediatrician?

Anything you choose. Oh, there are so many great options in the health care field for you! you can be both a pediatrician and a nurse (pediatric nurse practitioner!). You can be a pediatric physician assistant. There really is a vast variety of careers out there! suggest that you included spending time in pediatric offices to help your decision making. Volonteer in hospitals to get a taste, as well. Good luck!
Deciding. I think to follow your passion to see what makes you life better and you can contribute more.