Be happy. Think, "O Lord, You are my everything. You are my goal. You are my breath." Do not think, "This is mine, that is mine." Instead think, "All is You. All is Yours."
Sathya Sai BabaSwami cannot give peace of mind; you must work for it yourselves. First, stop the questioning and ask, 'who am I?'. This is my body, my mind, my intelligence. But who is this 'My'? Who is it that claims the ownership of that which is declared to be 'mine'? 'My' indicates ownership. That 'My' is the life. As long as the life is in the body, there is this connection between the 'my' and the intellect - 'my' body, 'my' house, 'my' land. But the moment you remove the life from the body, there is no 'my' or sense of possession. Life is God.
Sathya Sai Baba