This is obviously because you aren’t learning. You just don’t have what it takes to soak up the knowledge. And I think the most important thing to take away from all of this is that you aren’t nearly ready to start trying to program or condition your opponents. To the point that I will say if you started trying to do that you will actually hurt your progression.
Also I don’t think you have been “playing” for years. The way you have described your arcade days is an indicator that you can’t count any of it as time you have put into fighting games. If you are doing things and you don’t know why, or you haven’t been playing with 100% dedication to improve, scrap the time from your memory. In fact, drop everything and start fresh. Today can be your day one.
You don’t want to play robotically because that will make you predictable. Trying to play that way is giving your opponent the edge.
Stop worrying about loosing 100 games straight. And start focusing on why. I guarantee you that if you just chilled out and make a mental note of what happened that caused you to take a big chunk of damage, you could improve. Because you can take that info into the lab and practice how not to do it, how to do it better, how to just not be in that situation all together.
When you are playing somebody and they are kicking your ass, ask them why they find you so free. A dick will be a dick, a decent person will tell you what you are doing wrong. Take that info into the lab and practice what you need to.
If you aren’t consistently anti airing, practice it in the lab. Always set the dummy you are practicing against to be the character your opponent has been using to destroy you.
If you are anti airing a dude standing on the ground. Then suck it up bitter cup you are just shit. And that is an important lesson to learn. Because you can grow from that point. Until you accept what your level of play is, HONESTLY accept an HONEST level, you can’t grow.
ADD is bullshit, forget that’s even a thing. Because your responses show you just don’t know how to learn. Not that you know and you can’t do it.
I would recommend learning a few combos again. A corner combo, a mid screen combo, and a CA combo. Learn what your poke is and learn your anti airs, remembering that at different distances you anti air with different buttons. If you are playing as Ryu, don’t dragon punch. You can worry about the dragon punch later, as in months down the line.
Accept this will all take a lot of time and real focus. If you are ADD take your meds and try and focus. If you find yourself losing focus, take a break. And I complete believe you should maybe have an elastic band around your wrist that you can use to inflict some pain on yourself when you zone out. Verbally accosting yourself is helpful too.
Then do this shit.
Go into the lab and practice those combos. Do your first combo for about an hour. Hit reset after each attempt, shake your hands, flick your fingers a little. Anything to break the rhythm of practice, then repeat the combo. Do it at a moderate pace. Going through the combo as fast as you can, hitting reset instantly and going through it as fast as you can again, over and over and over, will have limited effect on your muscles remembering whats what and make it a little tougher for your brain to take it all in. Just accept you need to spend sometime doing the boring training stuff and get it done. After that first hour take a break for 20 minutes or so, get up and walk around and let your hands relax. Have something to eat, have something to drink. Then get back to training. Repeat the combo for 30 minutes. And take a 10 minute break. Then come back to the lab and repeat it for 15 minutes. Then you are done with the first combo. The spaced repetition helps you take a lot more in a lot quicker. Then save the next combo for the next day. Repeat the process and do the third combo the following day. Don’t even bother playing online for this first couple of days because you are trying to get your shit down. Once that is done, find out your best poke and practice it. Learn to perfectly space it. Have the computer walk the dummy forward and then back and then forward. You need to move with him and learn what it looks like when you are both moving and you can space your poke. You want to get it as close to max range as possible. Do this for as long as you can stay focused. Then take a break and come back to the same thing, but this time try and get your poke to whiff just out of the dummy’s range. Then spend sometime learning which anti air works from what jump in distance. After you have got all of this down, you can build a warm up routine. I like to use a dice and write down what each number corresponds to. Typically a combo. Then roll the dice, and do the combo it wants. then roll again, and keep repeating for 15 minutes. It warms up your hands and it separates the combos repetitiveness, like when you did the one combo for so many hours. Then do 5 minutes of anti airs. And 5 minutes of poke practice. Then jump online. Play some games, literally writing in a note pad after each game what you think went wrong. After about 10 games, look at the note pad and see what you have been messing up. Either stop the online play at this point and go and practice what is going wrong, or make sure you stop doing it in the next few games.
There is a bunch of stuff you can work on. But most importantly you need to be more mentally aware of the game, if you don’t see whats going wrong you wont ever improve.
Everybody sucked when they started. It was their drive to get better that lead them to improve. If you don’t have it you don’t have it.