The only way to become a better person is to act in better ways. When you can trust yourself by being honest and responsible, others can trust you. When people whose trust you have earned this way surround you, they are less likely to attack or blame you. Your life will be much, much easier than it would be if you broke rules all the time.
If you lie to others or your self, and act without thinking of what would happen if you were careless and unkind, you will make your own life very difficult.