It's not who you are that ...

It's not who you are that holds you back, it's who you think you're not.
 Unknown

More phrases

It really is all about believing in yourself: 80 per cent mental, 20 per cent physical.
 Victoria Pendleton
Courage - a perfect sensibility of the measure of danger, and a mental willingness to endure it.
 William Tecumseh Sherman
Regardless of how you feel inside, always try to look like a winner. Even if you are behind, a sustained look of control and confidence can give you a mental edge that results in victory.
 Diane Arbus
Courage is rightly esteemed the first of human qualities... because it is the quality which guarantees all others.
Optimism is the faith that leads to achievement. Nothing can be done without hope and confidence.

Quotes from the same author

The successful warrior is the average man, with laser-like focus and a chair that's not obtained from Craigslist that keeps poking into his back.
 Unknown
Honor your father and mother (this is the first commandment with a promise),.4 Fathers, do not provoke your children to anger, but bring them up in the discipline and instruction of the Lord.
 Unknown
Put yourself in a state of mind where you say to yourself, "Here is an opportunity for me to celebrate like never before, my own power, my own ability to get myself to do whatever is necessary".
 Unknown
Shopping online is fantastic for comparison shopping, because never before have you had the ability to see all the prices offered from everybody at one time.
 Unknown
Aim for success, not perfection. Never give up because you will lose the ability to learn new things. Move forward with your life.
 Unknown