Breaking out of a cynical mindset?

As I've gotten older I seem to be less trusting and more cynical about so many things. In part it's because I've been screwed over and have seen so many other people screwed over around me. The other part is that I have a pretty jacked up family which contributes to my current cynical nature.I am not really sure how to break the habit or mindset. I try to have positive thoughts, to force myself to smile, etc.