Our life is limited. We need a circle that inspires and educates us. Our defacto mind is negative. We need people to guide, advise, and believe in us. There is negativity already around.
Why waste time on it more with the company of friends or at work?
Our mind works when we are free. Our mind works when we have an optimistic worldview about everything. We cannot live a life with pessimism or failure. Our comfort zone should be risk-taking, not risk-averse.