The mind, like any muscle, must be exercised.
You will never see what you are capable of, although you must seek to.
One of the first ways to begin building your self-confidence is to focus on what's great about you.
The only way faith can be relevant is by preparing the mind to receive it.
Learn to trust and be trustworthy. When you treat someone as if they are being dishonest, you will train them to be. It's more powerful to treat someone as if they are being honest, and you will train them to now be honest, even if they weren't then.
To yourself you are what you think. To the outside world, you are what you do.