Discomfort can be a pain or a springboard for success. When you are uncomfortable you want to change your status. You are not happy with the status quo. This creates the impetus to take action. 

When you are comfortable you can easily become satisfied with status quo.  This can potentially lead to mediocrity. 

Therefore do not view discomfort negatively but rather use it to provide the impetus to change – and change for the better. 

To get to the next level of success, you need to leave your comfort zone and learn new things and seize opportunities.  
You have to make yourself accountable for going the next level or find a mentor who can make you accountable.