When you have to ask yourself this question, it means that you haven't fully discovered the components that make you who you are. Everyday is a day where you learn something new about yourself.
Self Exploration is the key to Self Actualization.
What makes you happy?
What makes you incomparable to others?
What defines you?
Everyone has something to offer the world. Greatness isnt only exhibited through artistry and the like. It can be as simple as how well you embrace others with your presence to how well you embrace others with your story. We're all children of the universe.
Embrace your potential. Embrace your Uniqueness. Embrace who you are