There is a constant tension between who we want to be and what we want to do. People will do terribly things while maintaining that they are not a "bad person." People will express what kind of person they want to be, but do nothing toward that end. Even people of faith will lament, while doing all the appropriate things, that they are not the person they want to be.
Jesus said, "The good man brings good things out of the good stored up in his heart, and the evil man brings evil things out of the evil stored up in his heart. For out of the overflow of his heart his mouth speaks." (Luke 6:45) Your marriage, your parenting, your ability to maintain friendships will never improve until your heart changes. The way you handle money, stress, and temptation will never improve without a heart change. Don't think that by doing a bunch of new things, or better things, that you'll magically change. It will certainly help, but it won't make the difference without a change of heart. You will have to stop acting, sit still, risk being alone with your thoughts, and pray like David (139:23)for God to doing the work of revealing what lies beneath the facade of the public self. The habits won't truly change without the heart change.
Read the Bible in One Year Plan: 1 Samuel 15-17