I Have a Friend

I have a friend that you can not see,
I have a friend that is invisible to all but me.
I have a friend that whispers in my ear,
I have a friend that I truly fear.
I have a friend that appears both day and night,
I have a friend that gives me a terrible fright.
I have a friend that won't let me be,
I have a friend that speaks ever so clearly.
I have a friend that you can't understand,
I have a friend that is always close at hand.
I have a friend that speaks my name,
I have a friend that will always play the game.
I have a friend that is sat by my side,
I have a friend that will never hide.
I have a friend that I say to thee,
yes I have a friend and now it seems I'm crazy