One of Napoleon Hill's more famous quotes is this one: “Whatever the mind can conceive and believe, the mind can achieve.”
The problem starts when your mind can't even conceive that things could be different... Too often I meet people, talk to people and they have just accepted that this is "just the way they are" and then they also find a lot of explanations and reasons for it.
Even though a certain behaviour, or a way you feel or what you say or believe or think, and no matter how much you feel it has been engrained in you, you can change it.
Yes, you may have tried other ways before and it hasn't worked. That is because it is all happening at the level of your unconscious. Plus you have explored ways that didn't work and once you have explored all the ways that didn't work you will find the way that does work. Keep searching or start working with your unconscious now...