The starkest reality that we all are alone is most difficult to digest.
But we can be happy all by ourselves with out any reason or purpose is again one of the most interesting and enlightening truths.
We are being operated by a software called mind.Mind is the root cause of all misery.The method to turn off ever speaking mind to absolute calmness is called enlightenment.
Enlightenment is realisation of the fact that your mind creates your memories, emotions and every thing.Just keeping you mind (not the usual thought process) shut can relieve you of all your imaginary worries.
Source: What is the harsh truth of life?