That's true. I don't think I'll be forgetting some of the close matches I've had recently, but I do also remember some of the hard losses, and I just think "I thought I was good enough to put up more of a fight."
If you find yourself struggling in a match save your replay and go over it later. See why it was that you lost. Look for wholes in your defense as well offense and see how your opponent reacts. It's really helpful.