It's pure psychology here. When I play live cash games, I pretty much don't even remember what my cards were once they hit the muck. But online, I can see them throughout the hand.
Sometimes I think it's a great device by the poker sites
--making you rethink the correct decisions of throwing away a bad hand.
DON'T FALL INTO THE TRAP.
Just like MediaBlitz said, "That's poker." So are bad beats. It hurts but you have to shake it off. In various training videos and in blogs, I've seen poker trainers say over and over again something like "well, if it turns out that I get coolered, well then good for the other guy. He got lucky."
Did you play your hand correctly? If the answer is yes, sigh and then move on. Learn how to do this well because if you don't, you're going to have a rough time with this game.