Almost failed high school (wasn't interested). Never went to college (didn't even apply).
Eventually, after coding through my teens, I founded a web development agency with some friends to build websites for money, while bootstrapping the development of a few web apps. All of them failed. I had severe imposter syndrome. Didn't help that my family had to sell our house while I was bootstrapping a startup, so I was basically homeless for a year.
Ultimately, one day I just realized that through all that hard work, I had somehow already made it, and that I was in fact a real developer, as knowledgeable as even my most CS-pedigreed friends coming out of school. It's about the learning, not the piece of paper.
Once I realized the true value that my skills and experience bring to the table, I began interviewing more confidently and negotiating more aggressively.
Fast-forward a few years, a few positions and companies later, and I am making over six figures with virtually no degrees or certifications, or student debt.
Uncertainty and doubt are not things to be feared; they keep you on your toes, hungry, and constantly learning, and that's how you beat college graduates in the job market. Don't succumb to imposter syndrome.