One of my favorite authors and speakers, Charles "Chuck" Swindoll, gave a talk in 1998 at a conference in Texas in which he challenged us to do the following:
Know who you are.
Accept who you are.
Be who you are.
I would simply add to it by saying, "Yes, because the world needs what you have to offer."
Chuck Swindoll turned 80 years old on Saturday, and still going strong.