Am I missing something?

So many times in life I feel like I am missing a piece of the puzzle. If I could only find out other people's secrets to being a mom or a wife... I feel like I am fried every day. I don't get it. Am I missing something? How do you handle it? Me, I tend to get frustrated and yell. Not a proud attribute by any means. I look around at other moms and I wonder how do they do it? I wonder if they yell, or if they have better control of their emotions. How so they handle the many questions from their little ones? Mine just tend to fight, or talk or scream themselves all day long.
I was sitting behind a friend in church on Sunday and thought "I wonder how her mom disiplined them." She is one of many brothers and sisters and all of them love God and are upstanding citizens, if not above and beyond the average do gooder. How did her mom handle it when she was fried? I feel like I am stuck in a pit sometimes, trying desperately to get out, but I am trapped. Why do I feel numb? I really have nothing left and the end of the day is nowhere in sight, at least it feels that way. I keep praying, for strength, grace, we all know what happens when we pray for patience... I guess I just feel like I am lost, that I somehow missed that chapter in the book of life. Does anyone know what chapter I missed?