hands like that happen pretty often, especially when you play a big volume of hands.
By the way, has anyone seen the Heads Up duel between Daniel Negreanu and Phil Helmuth?
They also had KK vs KK hand, And Daniel made a diamond flush

. But that did not help him, as Phil won the match anyway. In fact, I really like how Helmuth played that match, I really think he's improved his game over the years, despite what other people say.
So yes, bad beats do happen, just try to avoid going tilt because of them and you'll be fine. I promise.