Slow down. Have you read the Newbie Circle of Death in the beginners forum yet? If you have...read it again. Realize that everyone here goes through these stages. It cant hurt to take a bit of a break after bad beats. It sounds to me like you are a bit tilted. As far as your hands are concerned.

KK with an ace flop - bad idea to push him in unless you know it will force a fold...If he's got the ace the best way to make him lay it down is to continuation bet the flop and THEN the turn. Raising your turn bet...unfortunately the set hit and you were gonna lose the hand no matter what.

QJ - If you dont lose your stack here you played it wrong.