Fear is a human emotion that is triggered by a perceived threat. It is a basic survival mechanism that signals our bodies to respond to danger with a fight or flight response. Essentially, fear is an attempt to keep ourselves safe.
If you find yourself afraid of a situation, whether real or imagined, you can position yourself before God to be empowered and conquer the fear. He designed your body to respond to your focus. Choose one of his promises in Christ, remember that Jesus conquered death for you and allow your body to change its chemistry and serve you better.