what all these guys said. and i'll add, you're not doing wrong gettin sucked out or a 63o cracking your AA, play those big hands hard, you will not BELIEVE what beats you sometimes...be willing to die on your big hand, especially preflop against one other person, its a cheap tourney with cheap competition, its not your fault they suck
other than that, just be patient, even if it feels like you're blinding out, by that point, there's always that guy who's playing everything so your A2s all of a sudden isn't that bad of a shove hand
my problem is often after i've come back from the dead in a freeroll or cheap tourney, i don't know when to take my foot off the gas. i shove with a suited A and win, still really short, shove with a mid pp, win, then i'm all right for a little while, then that damned 99 shows up and i'm thinkin its time to shove again, boy am i always wrong...been getting better about that when such a situation comes up.
*edit* oh, and another thing, don't get all hung up about KO'ing ppl with your marginal hand, just because they're short and it only costs you another blind....let it be someone else's problem, they're staying short if no one calls anyway, don't get caught up in wasteful spending, "just because"