If you want to do something big, go to college and major in a non-CS subject. People are realizing social/apps has been so overdone and that there are more interesting and profitable ideas to work on -- ideas that require domain expertise in more than just CS, like healthcare, neuroscience, biotechnology, ecology, electrical/mechanical engineering, physics, real estate, interior design, architecture, etc. You can look to the recent YC classes for evidence of this trend.

At worst you'll graduate with a degree and lots of friends at 22 with almost twice that left before you qualify to receive Social Security benefits.