What should I be doing now to become the White House Press Secretary in the future?

I'm so interested in government and politics and I always have been. I know my chances are so slim but I really want to work up to my dream job. I'm finishing my high school freshman year now. Next year I am doing Youth and Government ( it's a sort of extra curricular thing) and I plan to take "Contemporary Issues and Public Policy" next year, law and society as a junior, and comparative gov as a senior. What can I do now?? Do I still have a chance? also I live in California, and it's unlucky that I can go to an Ivy League school if I got in because of tuition costs. I would like to go to Cal Berkley, U.C. Davis, Santa Barbara, or U.C.L.A. do I have a chance to pursue this dream??