At the age of 40, when Moses was cocky and over-confident and tried to free his people in his own strength, he was a big flop, and had to run for his life without them in a personal exodus of his own.--And it took God 40 years in the wilderness to teach him humility and utter dependence on God, until he no longer even wanted the job!--Then he was ready. He didn't think he was able, and that's good!--Because Man's extremity is God's opportunity. When you come to the end of your rope, then God has a chance to work.
He has to break us, and it's hard to be broken. Sometimes it almost makes you feel like you want to die. But then you're willing to live--for Jesus! For only from such death to self can life be born anew! (Jn.12:24,25)--"For it is no longer you that live, but Christ that lives in you, and you are now dead and your life is hid with Christ in God!" (Gal.2:20; Col.3:3)
So if you feel you are nothing and you're no good--cheer up! When you're so weak that you don't feel capable or sufficient, then God has a chance to take over and do things to suit Himself. Only He can do it! Just give Him a chance! Let go--and let God! Surrender to Him today!