Suckouts are a part of poker. They are frustrating, but if you play tournaments, you have to be able to take them in stride. It is very frustrating to go out on a bad beat, especially if you go deep, but it happens, and it WILL happen again and again in the future. Accept it, and continue to put your $ in with a best hand.

Another way of dealing with the suckouts (not for me, but it works for some) is to loosen up during the early stages, see a lot of flops cheap and try to build a big stack early or bust. This way you either chip up and should be able to absorb the bad beats when they come (and they will), or just bust early without investing too much time into the tourney. This strategy doesn't work for everybody - since you end up playing more marginal hands early, you need to be able to get away from dangerous flops, or be able to read into the situations where your hand, although weak, is still better then your opponent.