Next thing I do (after buying a house, of course) is start studying accountancy, because if I've learned anything from reading the news the past several years, it's that NOBODY can be trusted with that many zeroes.
After that, I've got friends who need help, and who deserve it much more than I do. I want to see them happy. Then I can start worrying about businesses and philanthropy and shit like that.
You're overthinking this. Read The Four Pillars of Investing by William Bernstein. Invest your money sensibly. Make sure that all your eggs aren't in one basket - invest with a number of different firms and with a broad portfolio. Pay attention to annual performance and ask questions.
Then look after your friends, although you'll discover that everyone looks at you in a different way.
Even when you're wearing your old comfy jeans, they'll look at your feet and see the $800 shoes that you bought because they're the most freakishly comfortable things you've ever put on your feet. Your Aston Martin key fob will start unwanted conversations with TSA screeners every time you pass through security (they all seem to think that a Ferrari 458 would be a much more sensible choice than a 4-door sedan).
Meeting people gets a bit awkward. They'll ask where you live and you'll tell them, "Just out of town, near the river," hoping that they won't ask the next question, which is, "Oh! How many acres? Three? Four?" You'll lower your voice as you start apologetically - "A hundred and sixty. But we have horses..." It's not the sort of attention an introvert enjoys.