If you repeat something often enough, you'll believe it. If your repetitions are affirmative, so will be your life. If you believe in something, it will work for you. Even if you don't like something, the more you see or say or think it, the more you'll like it. Habits are anything you do repetitively.
Good habits can replace bad habits.
But it takes time and effort. It's often simple, but it's rarely easy. People are more important. Friends are the best people of all. Friends are those whose inconsistencies we can overlook.