Everyone knows his own merits and demerits and I am sure everyone tends to criticize himself for demerits.
I approve self-critics but in some cases it can make the situation worse. Forgive yourself, it is useful. And if you have any inferiority complexes try to do the following.
Take some sheets (pieces) of paper and write the things you don't like about yourself or feel confused about, everything that disturbs you, on the papers and then burn them down together with your complexes. And forget about it!