How can i make big money? Looking for serious advice and ideas

I’m 17 and honestly a bit lost. I’m going to college, but I’m not really into studying or enjoying school—I just don’t feel it’s for me. My real dream is to make big money over time, not quick cash, but slow, steady wealth that could eventually make me millions. I’ve always had big expectations since I was young, and I want advice from people who actually make money. How did you start? What should I focus on at my age to set myself up for financial success in the long run? I’m in Europe, so any region-specific tips are welcome too.