Human potential is the same for all. Your feeling, 'I am of no value', is wrong. Absolutely wrong. You are deceiving yourself. We all have the power of thought — so what are you lacking? If you have will-power , then you can do anything. It is usually said that you are your own master.
To have faith is to trust yourself to the water. When you swim you don't grab hold of the water, because if you do you will sink and drown. Instead you relax, and float.
But there is suffering in life, and there are defeats. No one can avoid them. But it's better to lose some of the battles in the struggles for your dreams than to be defeated without ever knowing what you're fighting for.