As we “grow up,” we unfortunately learn that there are never enough hours in the day for all that we love to do (work has a persistent way of intruding upon that time for most of us). So it’s natural for you to feel that you may have to give up the central role music has played in your life up to this point.
However, don’t give up music entirely. There is no reason you cannot play your instrument for fun in your free time — even if that means only an hour a week while in nursing school.
You can change the direction of your life without giving up that which you cherish. Make it a point to bring music along for the ride.