Large businesses spend vast amounts of money to come up with a memorable slogan to identity them. There are many parts to a brand, but the slogan is supposed to capture the essence of a company in a few words. "Just do it" is one example.
Try doing this for yourself. Brainstorm about all the facets of your personality, your accomplishments, your values - everything that makes you "you." What makes you unique? Or maybe you'd prefer to describe the person you're becoming.
Sensitive introverts tend to be complex beings. Condensing your life into a phrase isn't easy. But give this a try and see what you come up with. Your life is a creation, just like a piece of art or a town or an experience. What name will you give it?