Good luck with being the youngest millionaire, I think there is like an 8 year old somewhere in the world that is worth like a quarter billion.
Anyways, welcome to the forums. And to answer your question, C++ can do almost anything. It's used to make a lot of different programs that you probably use on a daily basis, and is very simple to learn. You just need to keep learning more and more until you become confident enough to move to the next best thing.
As volatile stated, jobs can range from statistical programs and simulation to game designing to reverse engineering(hacking) . Be warned however, if you want to learn programming, its a dedication! It pays off tremendously though in the long run.