There actually was one thing I read on SRK that instantly improved my game.
Guile vs Shotos: S.MK vs jump-ins at ranges that’ll beat C.FP.
But that’s just me.
Walk 10 miles and you will always find you have 20 miles more to go…
One vs one “zero-sum” games with depth that depend on skill and strategy are all like this by nature. Unless you insulate yourself within a small group of people or only play against AI, you are simply going to run into people that have constantly put in more effort longer than you have.
If you play against random people from around the country, you HAVE to establish your level of commitment and establish a positive mentality around that. There are ALWAYS going to be large numbers of people that make you look like a fool even if you get really good at the game (unless you take the game all the way to the top competitive level by centering your life around it), so at some point you have to say “OK, this person is better than me and the odds are always going to be stacked against me, and so I will treat this match as an unfair challenge and see if I can pull out an awesome underdog victory”.
In the meantime, I agree that you can always glean a subtle lesson from a loss, even if it’s nothing more than reinforcing what you already know. The real fun of these 1vs1 games is seeing yourself improve, which doesn’t take a lot of effort and can be fun, and finding yourself at ever deeper levels of gameplay. You might progress slowly, never able to catch up with players around you that practice more, but you should still take pride in knowing that you have learned and practiced better things. It’s all about the journey.
If you have no fun improving slowly, and losses continue to do nothing but make you full of rage and disappointment, my suggestion is to exclusively fight against AI for fun (which I do with Killer Instinct - learning the AI’s patterns can be fun), or insulate yourself with people only on your level. You could also try working out, learning to dance or something, buy a good single-player game, etc.