If you want to make a difference, quit trying to cash out as a 25 year old millionaire.
Get a PhD and do research. That's the real risk in life, that you might work your ass off for little pay, spend 30 years chasing a dream, and fail in the end.
But the people who succeed change the world.
Interestingly, most Nobel Prize winners donate a large percentage of their prize money to charity or research. They weren't interested in early retirement in the first place.