"Our comfort zone is our “feel-good” zone. While in comfort zone, we feel well and safe. If we want to do something we've never done before, it's usually outside our comfort zone.
We tend to feel scared of the things out of our comfort zone. Therefore we avoid them or hesitate to do them.
The region in the brain which causes these feelings is called the limbic system. The main task of the limbic system is to make it possible for us to survive. So the limbic system tries to protect us from potential dangers - all with one goal: to survive.
To expose ourselves to new situations means a change. And the limbic system connects danger with any change - of course, because it does not know what to expect." READ MORE HERE: http://www.sapphiria.com/blog---en/why-it-is-important-to-leave-the-comfort-zone