You can either talk to the professors or go to an access disability center (I'm not sure what the name for it is for your college). College is harder than high school and there are more demands set forth onto you. However, you clearly have both the willpower and the intellect to enter college. You should not abandon your goals, but if the workload is too much, why not drop a course? There's no shame in that, and next semester/year you can take that course or do it in the summer. If your family or some close friends helped you out in high school, then perhaps see if they can help you now. I don't mean for them to do the work for you but rather that you still do the work, however, for college life and some help on the workload, you can have a helping hand.