What you find is that you need the freedom to be able to take a risk and fail. If you come from a household living paycheck to paycheck and just barely scraping by, you start off with a very risk averse mentality and never really escape it. When the big opportunity shows up, if you were risk averse your entire life it is unlikely that you will take the shot.
https://despair.com/products/overconfidence sums it up best: "Before you attempt to beat the odds, be sure you could survive the odds beating you".