I’m 20 as well and one thing I can say so far is finding mentors and associating yourself with people who do what you wish to do is very helpful. Even if that means working under someone.
At 19 I searched for mentors to help me learn how to trade the financial markets (stocks) now @ 20 I trade and I’m able to stay profitable, even though I have a long ways to go. I am slowly developing as a trader and growing my account.