The dissonance of trying to choose one path or another on which you could move forward and only forward. Is it necessary to choose? And if you choose everything and change roads, turning off the path, when the path near you disposes you, fascinates you... Comfort zone is a terrible state to which we by nature strive. When we reach a point, a place, a level, a position of that very zone, it is as if we plunge under water. Now we can't hear, can't see, and are content with the here and now. Something big? Or maybe it is nothing at all!
No, no, an existential approach to the question gives a quite obvious answer - safety! We feel safe in that comfort zone. We are confident in the future and have a strong sense of control over the situation. What is the reality? The world around you is so transcendent that your comfort zone is rapidly saving boundaries amidst a rapidly changing world. You are about to be trapped before you know it.
Only by remaining cognitive about life can you experience freedom. Listen and hear the people around you! Try new things! Your "good" and "calm" can be a huge cage limiting you not only physically but also mentally. And if the cage is still big even after a long time, then the consequences of your choice of "comfort zone" have arrived. Shall we go?!