My friend, we always look for peace and tranquility in external world, but we forget that the peace resided within us. we have to understand the bliss and quiteness in ourselves.
I have experienced this and I can tell you how to acheive this.
Only and only the meditation is the cure.
just sit down in quite place and meditate that calm and quite reside in your self.
I am sure within few days you will start feeling happy in your life.