Money doesn't buy happiness. Wanting to use every minute of your time for good use is a good way to burn out. Relaxation and unscheduled time is important. Enjoy your time now and always.
That being said, building wealth and becoming financially independent can be a worthwhile goal for many people. But it's important to have a good reason for doing it, to enjoy how you build it, and to view yourself as a steward of what you have so that you can make the best of it. Another early step is one you've already done: decide to build wealth. Some people consciously choose to, and others do not. Warren Buffett, for instance, knew he'd be rich when he was your age, and started taking steps to get there.
There are a number of ways to become a millionaire. Getting an education in a major that leads to a good-paying job can be a good start. It can allow you to build sufficient capital to invest or start your own side projects. Starting out as an entrepreneur can be good too, with a potentially higher risk/reward.