You have to be crazy to run a startup. 9 out of 10 times things get screwed. Be it team, customer, product, legal, investors or partnership. Nothing is certain. We have limited things in our control. The outcome like the shiny unicorn also depends on many externalities.
All we have to do is to keep heads down and take every single day as a new beginning.
Reading eBoys shows the craziness eBay went through is amazing during their IPO.