Who am I?

I have been guilty of this same doubt as Peter and guilty of listening not for obedience sake but only when I'm certain it leads to success by my worldly understanding. Ive had that same Peter Moment when I realized I only listened to God when I'm certain it leads to good things but what about those moments when your tried all day to make some good and then Jesus says try one more time. I usually flake because all my energy was wasted from doing nice but trivial things. This epiphany hit like a rock to the stomach. Who am I? A sinful man as Peter exclaims. Ugh! I feel myself change everyday, My thoughts are not the same. I know its because of the Word of God. This is encouraging.