Most people fail before they start, held back by limiting beliefs. Those who do begin often spread themselves too thin, launching multiple businesses at once instead of focusing resources on a single venture.
Why do you think that most people fail? I think it depends on how we define failure. For the people who don't start, it's probably a belief issue, and that's the vast majority of the people. They fail before they start the race. Of the people who do start the race, distraction is a huge one. They start 6 businesses in the hopes that one of them will take off because they fundamentally don't understand how business works. You have very constrained resources in terms of time, money, effort, and you have to allocate all of those things to one business to just have a hope that it's going to work.