Life is not fair.
When I was a child and came in the house telling my mother how I got cheated, ripped off, or someone was unfairly given special consideration over me she'd simply yell at me; "Life is not fair!"
Oftentimes it brought tears of anger to my eyes. However in the end it removed my "rose colored glasses" "approach towards life. I learned to deal with things as (they are) and not get so bent out of shape talking about how things (ought to be).
"Sometimes you get the elevator and sometimes you get the shaft." That's just life!
Once I accepted it I was able to keep things in perspective.