What's Holding You Back???

I’m holding myself back. Deep down inside I know that I want to be a musician! But on the surface, I feel like nothing I do will be enough. Singing is my passion, I sing all the time. But something in me just tells me,
“Give up the dream and find a new one. You know you won’t be the next Martina McBride or Carrie Underwood. You’ll never get anything accomplished.”
I don’t know how I can get free from myself. I want it so bad, but that voice inside my head is holding me back. My voice.