You've just described nearly everyone i have ever worked with, People don't listen anymore they just wait for ther turn to talk!
Some people where I work assume i am quiet and shy, others might assume I'm grumpy, in truth I cant be bothered to listen anymore to other people stories/woes etc if they can't be bothered to listen to me...So i have stopped engaging in office chitter chatter.
The sad thing is though my eldest step daughter is exactly the same if not worse, she will often interupt what my wife is saying to tell her own story (hopefully this is down to immaturity and she will grow out of it) but i have in the past interupted my sd and asked her "what did your mum just say to you" and she looks at me blankly..not listened to a word her mum has been talking about...
My advice, next time one of your colleagues is telling you about their family, yawn loudly and say thats "thats nice" whilst looking completely in the opposite direction.