Are you in a job or a career?
Do you work willingly or because you feel obliged to do so?
Do you make a point of doing more than is asked of you?
Do you use your initiative or wait for instructions?
Your answers to the last three questions will tell you the answer to the first one! Too many people never even think of realising their full potential: they settle into a life of mediocrity never daring to step outside their comfort zone.
They blend into the grey background and become part of the 91% of employees who suffer from the "Monday morning blues", which incidentally usually starts at about 3:00 o'clock on a Sunday afternoon!
Does this ring any bells for you? If so, perhaps it's time to step out of your comfort zone, to do something different or at the very least to find a new working environment that is more conducive to your wellbeing.