From Teddy Roosevelt’s “Citizen in a Republic” speech:
It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat.
Also an exceptional book.
Look for small victories and build on that. Each small victory, even if it is just getting up 5 minutes earlier, gives you confidence. You realize that these little victories make you feel great, and you keep going. You realize that being paralyzed by fear of failure is worse than failure.