The impossible is, well, impossible.
Regardless of how hard you work, your mind, soul, body and spirit will NOT allow you to create something that is impossible -- so until you believe it is possible for you to become _____(fill in the blank), you won't be. That could apply to becoming a millionaire/loved/happy/wealthy/accepted/spiritual/a certain job position/or whatever it is for you. What would you LOVE to become, but feel frustrated about? Believe it's possible. That's the first step.