Nursing is a noble profession. If you become a nurse work hard, spend wisely you have the opportunity to own a boat and a home and retire early and go cruising. Those opportunities greatly diminish as a professional sailor unless you become a merchant marine. As a traveling nurse you get paid more and can work seasonally, so you could be cruising on a boat and return home to do a few months of work and go back to your boat and continue cruising. I can think of very few careers that lend itself as well to supporting a cruising lifestyle.
That is the key. Do not compete with your peers at work. Begin living like a cruiser, simple and respectful of the resources given to you.