"If you don't like something, change it. If you can't change it, change your attitude. Don't complain." ~ Maya Angelou
Reminds me of the another quote (don't know where I heard it): "Are you  complaining because your life is miserable or is your life miserable because you're always complaining?"  Something to think about. 

Want to change how much you complain?  Check out www.ComplaintFreeWorld.org for a rubber bracelet.  Goal?  To keep it on one wrist for a month.  Tricky part?  You have to switch wrists everytime you complain.  But imagine what your life will be like if you don't complain for a month???