None of what we do as founders is saber-toothed-lion scary 

Take the time to understand your mind and how it processes fear. Anxiety is constant at a startup, because we’ve designed our lives to be challenging. We don’t simply find the solution for a problem and stop, we are greedy little bastards we founders — we keep looking for more tigers to take on.

http://calacanis.com/2015/01/10/dont-overestimate-the-downside-of-risk/