Not many people work in the exact field they went to school for.
It may be what you do when you first get out, but most people changed jobs at least a few times on their way to finding a true career. You may start out as a tech for Nissan, but you may end up being a Service Mgr for John Deere dealership. Or you may end up being a Regional Service Mgr. for Hertz Equipment Rental. You honestly don't know what doors are gonna open for you, but you have to be ready to walk through them when they open.
If you drop out of school now the odds of going back are slim.
Also remember their are 5 other guys that will be looking at the same job as you and all of them finished school.
Which one would you hire?