Changing your attitude must start with changing your mind....if you know you are too cynical and want to change it you have already done the hard part now all you must do is simply convince yourself to stop doing it.....try to challenge yourself to find the silver lining in every thing that happens in any given day....car blows up...oh well I needed a new one anyway....wife left me...thats cool now I have nobody to answer to other than myself.....just change your perception...its only as hard as you make it.