If you're an entrepreneur, you will fail. It might not be a complete meltdown, but you will experience a failure of some aspect of your venture at some point.
My first business failure occurred during my mid-20s. I tried to launch a product I invented, which was a durable, pocket-size strap that carried different kinds of recreational sports gear.
After determining the market need and securing piece-work manufacturing, as well as retail packaging complete with trademarked logo, I had several thousand units in hand.