Expectations – Why have any?

Why have expectations at all?  Things never end up as you would expect them to any ways, all expectation is, is the precursor to a huge let down, a failure, lies, and most of all disappointment.  Is expectation needed?  Is it there to fool ourselves into ideas of grandeur?  There was a time that the only expectation I had was to see the next day in one piece, and most of the time that was ninety percent in my control, the other ten percent was not, and if it was time, well it was time.  Some where between then and now I fell into the trap of expectation, of which has led to disappointment.