know myself

I have always pondered about this question when some life changing experience happens to me. Sometimes I do not know why I do somethings that I do. I find it critical for me to write stuff in my journal of all the experiences that I have and how I handled each situation. The journal is what I call self criticism diary. We find it so easy to point out the mistakes of others but we could hardly even see our own. Even if I ask somebody to criticise me, I find myself arguing with them and saying that they just have a different opinion in the situation. Self criticism I think is very important cause you could never hide from the reality that you made a mistake and should not run away from it but prevent it to happening again. Sounds pretty easy huh but yet everytime I do this myself it takes me days to get back on my feet cause I feel so stupid when I find out that I have done wrong. Well we are only human and making mistakes are in our nature which makes us stronger and wiser. Dont you agree?