Was this all in pre flop? Its a cooler any way you look at it. If you had KK and lost to AA you'd feel just as unlucly. It stinks you actually had the AA here but KK can never fold. Unlucky nonetheless, I am not trying to be unsympathetic. Better luck in the future.
In any competition is a winner and a loser, this is a nice poker hand for the winner, unfortunately AA brought you bad luck but was required to give all the. A friend of mine says, if the AA does not give all in, then on that !,,