I recommend graduating, but if you were unable to work on your startup due to your poor work habits, why do you think you'll be able to handle 20 hrs a semester

I recommend graduating, but if you were unable to work on your startup due to your poor work habits, why do you think you'll be able to handle 20 hrs a semester? That's also lots and lots of work (on things you may find boring). Why not ramp up gradually?