You can get there two ways, so It happens to everyone.
You can choose to push yourself out of your comfort zone in order to reach the things you desire. The more you do it, the more comfortable it becomes.
This skill can also be used to allow uncomfortable situations to persist longer than they should. Uncomfortable jobs, relationships or ways of life become more comfortable than the effort required to make things better.
Seek discomfort that makes you grow. Eliminate comfort that keeps you from growing.