One of the essential truths of the Christian faith is learning the difference between spiritual life and physical life. You are a new creation in Christ. When Christ lives inside a person, you have new potential. God is creating a new nation of people.
We learn from the confession of King David that we were born sinners and we need to acknowledge our sin to God so that we can be forgiven, cleansed and begin experiencing joy. We spend too much time comparing ourselves to others rather than to Jesus and the teaching of Scripture.