Based on your description, at the fixture, you’ll likely have something called a switch loop:
You can see that the power source comes to the light fixture, then the hot wire is sent over one wire (the white in the diagram) to the switch where it returns from the switch on the black wire.
You can rewire to make the fixture constantly hot (connect the power source line to the fixture directly) and then connect the two wire going to the switch to the hot (black) and neutral (white). This will give you a hot and a neutral in the switch box without having a switched hot (load) going back to fixture.