The choice is yours

You can either tell yourself, “It’s too hard, I don’t think I’ll be able to do it,” or, “Yes, I can do this. Let me at it!” Only a fine line separates the two.

But I’ll tell you one thing: If you work like crazy, you’ll come to display capabilities that you never knew you had — potentials that you always possessed, but never tapped.
~ Josei Toda