Not sure on what to do. Advice?

I am young, not in college yet. I don't know which career to have. I have taken many career tests and none seem to have any affect. I would love to run some type of charity, one that I know where the peoples money goes to. If I were one of these celebrities, I would have a few hundred thousand but the rest of my millions would go to charities, sounds crazy to some though, but true. If were building schools, I would personally be there to inspect them. If I were feeding children in Africa, I would be there to personally give the money to them. It only takes $1.35 to get out of poverty in Africa and for a lot of people here in the west, that's pocket change. I just am uncertain on what to do. I have also wanted to go to some great school, like Yale or something, though it isn't a particularly easy task to accomplish. If anyone can give me some insight, it would be a great help. Thank you!