I watched this video and I think you are a better player than you think. You have a nice defense and the majority of your games are close. As said before; time is needed to learn how to input commands correctly and then begin stringing them together in a way you feel comfortable. I assume you know, but fighting games take time to develop skill. Take your few weeks you have been playing and turn it into 3 to 6 months. Over time you will adjust and become a better player.
I would advise spending time on 3rd Strike as I personally feel its the better game to learn on. (It boils down to personal opinions and what I feel, 3rd Strike is the true 2D beat em up from original SFII) I can’t comment on UMVsC as I still haven’t bought them yet but I believe it may be too hectic and the combos/air juggling may be even harder to grasp(?). I’m sure you know how to use an emulator why not give past SF II series and Alpha series a go. Practically everything stays the same so you can use Ryu without losing skill in IVAE. Though you may get disorientated jumping from one game to another and returning to IV. (and if you haven’t give Ken, Segat, Sakura, Dan, Akuma, and Gouken a go as they are all Shotokan players, Akuma, and Gouken may be more difficult to grasp without practice. Your probability well aware Ryu, Ken Sakura and cough Dan are all almost a like).
Again as said hit training, know in your head what move to preform, and do it slowly pushing the stick and buttons in order, all about practice. One thing I found helpful myself is having a friend play vs you. My friend spanks me in every single game we play and I never expect to win, but I don’t care as he has been consistently playing fighting games on every system imaginable. Playing vs someone constantly that will go round after round with you can help build you as a better player, you can watch how someone reacts and counter it yourself, you can try and map out a play style vs someone thus improving your timing and pattern all live in game, without having to jump from one person to the next. Though that is also a good thing as well. I never meant to type half of this, but the more you think about a fighting game the deeper it can become and understand that its not an overnight learning curve.