"Everyone has inside of him a piece of good news. The good news is that you don't know how great you can be! How much you can love! What you can accomplish! And what your potential is!" -- Anne Frank (Germany)
I think that's a good reminder of who we are. We are not meant to live mediocre lives but were meant to live outstanding lives. We are each given a talent by which God expects us to put to good use. And this putting to good use should not only benefit the self but should contribute to the well-being of the other or others. I think that is just what we are supposed to do.
We were designed for a life that should shine with who we are with our God-given talents. To shine does not necessarily have to mean being on the center stage of achievement or drama or grandiose trappings or show. That could be nice but isn't the only way. I believe that there are a diversity of ways to shine as there are many different talents God has poured upon each and every person.
Here's another quote I like too:
"We have different gifts, according to the grace given us. If a man’s gift is prophesying, let him use it in proportion to his faith. If it is serving, let him serve; if it is teaching, let him teach; if it is encouraging, let him encourage; if it is contributing to the needs of others, let him give generously; if it is leadership, let him govern diligently; if it is showing mercy, let him do it cheerfully." -- Romans 12:6-8
The trick I believe is to discover what yours is. Because truly you can be great, you can love amazingly, you can accomplish wonderful things, and you definitely have potential. That, incidentally, is by God's design.
So shine with your light.