choosing rather to suffer affliction with the people of God than to enjoy the passing pleasures of sin,"
Hebrews 11:24-25 (NKJV)
Everyone has a way that they are identified, and usually that identification is done using your name. Normally your name is something you are given by your parents. Sometimes, a person may use a different name or get a nickname from someone, but it is your actual, legal name, that you have to use to be correctly identified. No matter what other people may call you, or how someone may refer to you, you have to use your actual name to identify yourself and to do business.
While our natural identity is important, our spiritual identity in Christ is more important. Hebrews 11 gives us an example of this as it tells us that Moses refused to be called the son of Pharaoh's daughter. Naturally, in his situation of being raised by Pharaoh's daughter, many people probably referred to Moses in that way, but that is not how Moses identified himself. Moses identified with the people of Israel, God's people, although it would have been easier in some ways to be called the son of Pharaoh's daughter.
Our identification as a child of God is vital to living in the reality of what Jesus has done for us, and in fulfilling the will of God. It does not matter how other people may have identified us, or what they have called us, we need to find out how God has identified us and focus on that. For example, God has identified us as a new creation in Christ (2 Corinthians 5:17), the righteousness of God in Christ (2 Corinthians 5:21), and more than a conqueror (Romans 8:37). Don't let others define you or just accept what others have said about you, and believe that is the way it has to be. No matter what others may say about you, identify with who you are in Christ.