What does it take to win an MTT?

[TexInAtl]

In the last 4 tournaments that I've made it ITM, the hands that have knocked me out, or left me severly crippled are: AA, KK twice, and QQ.
My last bubble finish, I was left severly crippled after I flopped 3 Ks and lost to a flush. This coming after I had held the chip lead in the tournament twice.
My question is this: Am I doing something wrong, or is this pretty par for the course? I'm still looking for my first win, but it's extremely frustrating when the hands that should put you at the final table are the ones taking all of your chips.
Is this a normal pnenomenon?

Thanks