I know the feel, I'm still having PTSD flashbacks from when I got 3-0'd by a Phase-4. What really hurts are losing the winnable matches. Opponent is beatable, but you lost because you flubbed a juggle sequence (for example). One mistake, right?
Even worse when you already know what will happen and still mess up... At least in the end i was able to mess him up with Tengu, even though i lamed it the hell out. Need to learn that match up more.
Ofcourse that doesn't make feel any less demoralising. But you gotta try to track your progress by what you've learned rather than win loss ratio.