Often times in life, in order to grow, you need to feel some discomfort. Feeling comfortable is great, although being "too" comfortable can equal no movement and leave you in stagnation. Only you truly know when your playing it too safe in your own life and sticking too close to your comfort zone. It's like playing tag and never leaving safe. You might as well not be playing.
To keep growing, challenge yourself to try things and act on situations that push you out of your comfort zone. Outside your comfort zone is where really cool and life altering possibilities lie for you.
Take a leap.