aw welcome to being a legally recognized adult :p happy birthday!
I agree with you, age is just a number. We learn things as we get more experience, but age has nothing to do with what makes you you. I think too often people try to group by age-- schools are especially notorious for this. And this really artificially limits your circle of people, and robs you of the chance to share experience with people younger and learn from people older.
I think the crypto world is in its infancy and you'll be able to have your dream of finding income online :) Even just saving whatever amounts of Bitcoin, Steem, etc that you can get your hands on, it should go up over time-- not the same as income but it would help give you some breathing room while you explore whatever you're interested in.
I get the sense that you don't need this advice, but you can also think about ways to simplify your life so that you don't have many unnecessary expenses! And then even just a little income goes a long way.
I hope you enjoy your cake lol