We all feel fearful when we are pursuing something big in our lives. It's scary to drop what you've been doing for years and take a different path. It is scary to invest money in a project that we don't know is going to be profitable. Nothing in this life is certain (well, they say that only taxes and death are).
Millions of years ago, our brains became wired to remember about 150 people as "close friends". This is probably because early hominid tribes gathered in communities of that size. Today, this explains why an infantry company organizes around that size, and why smaller companies do better per-person than larger ones.