You may...

You may think you know me
but you don't an illusion is all you see

You may think you understand
But you can't not by any small demand

You may think you care
But you never will, I won't be there

You may think you can make me smile
But you couldnt, not by a long mile.

And you may think you can read my mind
But you shouldn't. Who knows what you might find.