I would find a job more in line with your interests or volunteer for something you would enjoy doing, just to get in the habit of doing things non school-related. It is scary changing over to something new, you have been doing what you are doing for 12 years now! Leaving one's parent's home and going out on one's own can be quite scary/unpredictable. You an predict your good grades by now, etc.?

I would turn working or volunteering, etc. into a "project", pretend it is a college course and set up what you would like to learn, how much you would like to save, what you would like to buy, what other sorts of jobs it might lead to, etc. Try to turn it into more familiar "lessons" for yourself?