What works with one child does not always get through in the same way to another. We need to express confidence in their character. In the Bible, God said to Peter that He believed in him even though he wasn't at that time the way he should be. We have to show infinite belief in our children, or loved ones, and who they are. You can make it.
Every child seeks the approval from their parents, especially their Dad.
For many of our children there is no father around to take their part. But we do have a Heavenly Father, a Spiritual Daddy, that we can seek out, and look to for help, in the absence of their own birth fathers. Pray, trust God, and ask for some committed father figure within your church, youth group, or other organization, to help fill in where possible. Grandparents, friends, family members, etc. Allow them to.