Whichever field you choose you must A) Have Mazel and Bracha from Hashem B)Be happy C)Do your hishtadlus by picking something that is viable
I assume as a guy you might like cars and driving cars. However you would never consider being a full time parking lot attendant just so you get to drive different cars every day.
You might however take those interests and become a car salesman or invest in a dealership turning your likes into a possibly viable career.
There is nothing wrong about being realistic about needing to make money.True Hashem can bring a windfall but Ain Somchin Al Hanes,you cannot rely on miracles.
To answer your other query strictly differences in salary Biderech Hateva you will make more money as a nurse for at least the first five years after obtaining a masters,and in most cases will not have the same amount in student loan debt.
In order to exceed a nurses salary as a social worker(including getting your masters) after approximately five years in the field you will top out unless you are able to get further certifications (you will work on these things after your masters and it can be done within 3-5 years after graduation)
Additionally,you most probably will work in private practice and be willing (given the current economic times )to take insurance.
After you establish yourself as a private practitioner working full time including evening and some sunday hours, salary for a social worker will be at a range anywhere between 65K-low 6 figure. Otherwise your top off point will be bet. 55-60K
Re Nurse: You will not have to run for clients or worry about salary as your achrayis There are even agencies that will help you find homecare clients. Your top off point if you can get certain certifications and supervisory positions will theoretically be that of an extremely successful social worker.The mid-range nurse without all the above and working full time will be in the 55-75k range still more then a full time social worker that is not in some sort of private practice.( I assume you realize that as a very successful nurse you might also have to work some evening hours)
Take your strengths and interests and sort them out.The career counselor on campus night be able to be of help.Speak to people in the fields that might interest you and then realize what might be realistic for you. You might even pick a profession that currently is not on your radar
Hatzlacha in whatever you choose:)