Daoism is what this post reminds me of. Im not one, although I have a certain attraction to it. You are what you are, accepting it will make your life much easier. Self doubt is a decision to not accept yourself. Look, I'm a father too, I could be more gentle at times, More understanding, more easy going... On and on. Sometimes that isn't our strong points. Its alright. Our wives/girlfriends have an expectation that may be impossible, some fantasy. Your goal is to raise your children as best you can, no one is perfect. The hardest thing is to let go of your worries and know you will contribute something to your kid no one can. Your an intelligent guy that knows far more about the world than most ever will. When the time is right and your kid questions his/her very existance, there will be no one in reach that could possibly lay it out like you. Good luck bro, do your best and there is no regret.