Advice to my younger self and you after 20 years in programming

Medium recommended me this article. Reading it made me realize that I've wasted my youth on useless side projects that don't generate revenue and that realization filled me with dread, despair, and self-hatred - I hate myself for not spending my youth more wisely. But I wanted to know what you guys think. Do you agree with it?

GIven the title this piece is very short on advice. More like "look at me and what I achieved". For every person like this there are 100 who did the same and failed. This isn't advice.