I'm in a similar predicament. My college education is $50,000/year and my parents make too much to qualify for financial aid.
I applied to a few independent merit scholarships, and I recommend you do the same. Even if you missed the deadline this year, you can apply next year. Ask your (ex?) counselor about any local scholarships for which you qualify. Also look into possible company scholarships (assuming your parents work for any companies).
Also, I think TAing (teacher's assistant) is a good idea once you know enough to do it. Part time jobs, if they're feasible, will probably be the largest source of income. Look into research programs that will pay you (I know, at my school, students can get paid to conduct independent research initiatives or to help a professor with his research).
I'm not sure if this will apply to you, but I'm also looking into investing in stocks. If you're willing to learn how and if your parents are willing to give you a bit of money to start a portfolio, that could translate into a handsome sum by the time you graduate.