Just as I would hesitate to point any devout young Catholic man straight to the priesthood, I’d hesitate to tell you what you ought to take up one career over another, just because you are Catholic.
The faithful are meant to do every kind of good work. Good Catholics are to be found in medicine, yes, but also in business, engineering, law, education, the arts, and so on. Could nursing or some other medical profession be a great place for a Catholic man to live his faith? Absolutely! But he could also do very well as an educator or a lawyer, a police officer or a fireman, a restauranteur or an engineer, and so on. Bl. John Paul II studied acting before entering the seminary. Many men who become permanent deacons later in life do so after a career in business. There are many possibilities!
You ought to look at the special gifts and passionate* interests that God gave you when you decide on a career. *(I mean licit interests, of course!

) Look at your spiritual weaknesses and areas of difficulty, too. If you are prone by temperament to stretch the truth, well, maybe you ought not go into business, because a good Catholic businessman must be able to keep his integrity in spite of what might seem a status quo to the contrary. If you are easily overwhelmed when you are pulled in many directions by the needs of others, well, maybe nursing won’t be a good fit for you…unless, of course, you find the challenge of mastering that difficulty particularly inviting. If you love writing so much you’d do it if you weren’t being paid, look into careers that will put that passion to use. You are, after all, going to have to serve your chosen field with excellence for decade after decade. God gave us each different aptitudes, just as surely as he made cats different from dogs different from ducks different from elephants. To answer your call to live your faith in your paid work, then, look for what God made you to be.
If nursing attracts you, though, then yes, that is a suitable career, of course! The history of hospital care for the poor would be impoverished to the point of non-existence if not for the pioneering work of communities of professional religious, both monks and nuns. That implies it is among those fields of work that are an excellent fit for those pursuing an intense spiritual life.