Start-ups make at least as many mistakes as everyone else. You just don't often get to hear about them. But we always learn more from what didn't work; from looking at mistakes of others; than we do from sanitized case studies of success.
"Running a startup is like being punched in the face repeatedly." I can think of no more accurate phrase to describe the process of running your own business. It's a quote from Paul Graham, founder of startup accelerator Y-Combinator.