Good humor is a tonic for mind and body. It is the best antidote for anxiety and depression. It is a business asset. It attracts and keeps friends. It lightens human burdens. It is the direct route to serenity and contentment.
What is a fear of living? It's being preeminently afraid of dying. It is not doing what you came here to do, out of timidity and spinelessness. The antidote is to take full responsibility for yourself - for the time you take up and the space you occupy. If you don't know what you're here to do, then just do some good.