Hello Emmanuelle,
Remember the disciple Peter. He was known for having a short fuse.
Also remember that when we act out in anger we are acting from the child within us. The moment we realize this we then can allow our spiritual self to comfort and re-assure the child within us. When the day comes that we comfort the child within us without thinking about it then we will have become whole and at peace with ourselves. Once we are at peace with ourselves then the rest of the world will reflect your inner peace.
Blessings to you,
Archangel