It's normal. Most people don't realize they are whining, but once you do you can change it.
I think one of the best things to have is a 'whatever' attitude (in a good way), or I suppose a better way to put it would be 'go with the flow'.
Just focus on the positives of a situation, and say 'never mind' or 'whatever' about the negatives. Is it really that bad? Not really.
Trust me, it will change your life when you change your attitude!