I didn't stop going to school because it "Isn't for me". I stopped going because my GPA was tanking and I was embarrased.
What about your GPA getting lower was embarrassing?
My teachers kept confronting me about it and I just couldn't face them anymore.
Being embarrassed about your grades going down is fine but you shouldn't quit school over that or anything else. You're going to have a much harder time in life if you don't go back and finish. If your grades start slipping adjust your priorities and try harder.
I don't have time for school.
I understand where you're coming from but you would be surprised how easy it is to set time aside for school. You shouldn't think of school as consuming all the time in your life, is easy ways to get things done in a timely manner. Trust me, it'll be worth it to graduate in the end.