I would begin by looking into scholarships. Try Student Scholarship Search
and Scholarship Points
, and apply for as many scholarships as possible.
You also should consider the idea of trying to get a part-time job during the school year, which can add up to another few thousand dollars.
However, if you are still struggling to figure out how to cover the costs of college, you might have to take a gap year, and spend the year working to pay for college.