You are right. People who try to become like another are trying to become another person God doesn't need one more of. To fully fulfil one's purpose, self love is needed. When you love yourself enough, then your eyes can be opened to see what you can leverage on to fulfil purpose. Like you said, no one is born useless. We are all blessed with gifts albeit in varying levels but we should always stay faithful to fulfil it because in it is our redemption and reward from God the Father through Jesus Christ.