Billion Dollar Ideas?

I'm 15 years old, and still have 3 years of highschool left. I dont want to go to school, just to end up working a job that makes enough to pay bills, or a job that i dont like. I know it's easer said then done, but i want to be the next youngest billionaire, like Mark Zuckerberg. So while i'm finishing these years of highschool out, i've been trying to think of the next billion dollar idea, product, company, whatever, but my mind always draws a blank. If anyone has anything that could become that next idea, please share? If you don't want everyone on here to read it, message me or somethin. But it's not like i'm just on here with wishful thinking, i'm determined to reach my goals, this being one of them. Thanks.