We also had an excellent role model: Jesus. Although the phrase is a bit outdated and worn, "What Would Jesus Do?" is a question I ask myself when I'm not sure how to act. It never fails me as I remember Bible stories that illustrate loving acts.
You have experienced God's mercy and grace. You know how it feels to be forgiven and loved for the person you are. Use those experiences and feelings to help guide you in treating others with love.