Is Enough Actually Enough?

How is it that no matter what I achieve, I feel like it isn't quite enough? It's almost like I am on a treasure hunt, acquiring gold yet still on the search for the real treasure. Surely I can't be alone?

"You are your harshest critic".

I can't pinpoint it exactly, but there was one stage in my early twenties that snapped something inside of me. Within a year, I excelled in my profession and became the strong woman I always dreamed of. Now this is easy for me to just type out, however, if I am being honest, I don't feel a sense of achievement at all. When I look in the mirror, all I see is what can be improved, and what I can still achieve. There really is some truth in the saying, "You are your harshest critic".

I guess what I am wondering is, when do you start to feel like enough is enough? Is there a moment in life when you sit down and feel a sense of accomplishment?