Making these kind of mistakes is something people avoid. But I'm a little happy I made this in my 20s. It can accelerate your learning by years to even decades. On a longish view of things a lot of things that are clear to me, are still murky to people in my age peer group. That kind of helps making lots of beneficial decisions especially financial and health before others can even see or realize them. You come out ahead in the bell curve.

A start up failure might be painful, and even a little expensive. But it's like a college degree, or other high quality training program. It teaches you a lot and most of it is beneficial stuff if you are willing to apply the lessons elsewhere.