I think my recommendations are:
* Pick a main to focus training on
* Learn basic fundamentals of the moves (which moves are generally safe/unsafe, the range you can hit with them, no need to get crazy with frame data details yet).
* Git gud with one bread-n-butter combo, CC combo, anti-air combo
* Git gud with your hit-confirming.
* Git gud with anti-air.
I watched 3 matches as well , again I'm not great at the game myself ( I have 849 LP or something). Your cammy seems to have some good things happening but like Teh Lurv says here , there are holes in your game that would be patched by just picking 1 character and sticking with them for awhile. The Ryu match I watched you kept doing forward + HP and yeah, when it hit you confirmed it into a DP with what looked like relative ease and even at one point cancelled the DP into a Super which is great ! but when you spend an entire match throwing out buttons , SFV is built to punish you. Your opponent will get counter hits on you (which do more damage) and even crush counters (which can lead to a big combo and 40-60% life loss).
I'd honestly suggest just going back to Ryu for a while. Go into training mode and test out all of your normals. See how far away you need to stand to hit with each of them, standing, crouching , jumping in. All of it. Do the same with command normals (for ryu that would be forward HP and forward MP). Practice Ryu's target combo too , if you can land a MP you can hit HP and then hit HK for a 3 hit combo that doesn't really require timing.
As well, and this is something that I also do quite often still - learning when to block high or low helps mitigate damage quite a bit. It's not so much that you weren't blocking but more that you seemed to get impatient and hit a button. During one of those matches (I think it was against a zangeif player) you were actually in the perfect spot to block but you tapped a jab out and then got hit by a critical art.
Why learn spacing and blocking ? because then you'll take fewer unnecessary risks and take less damage which gives you more chances to deal damage. I'd also suggest not throwing out your Vtrigger "raw" that is , just flicking it on randomly. Vtrigger activation for most of the cast (outside of fire and forget triggers such as Nash or Rashid) will give you a split second extra time to react. For example, with Ryu , if you're being jumped in on , popping vtrigger can give you a chance to throw out a DP that will be much more likely to hit the jumping opponent. For Cammy you have a better chance to cannon spike , etc.
Also don't be afraid to throw, it gets in peoples heads and makes them expect them , so just throwing them once or twice per round or teching a throw will leave your opponent guessing more.
My own personal problem with my playstyle right now is that I'm still pretty brain dead , I just go for stuff and hope for the best but I attempt to block as much incoming attacks as I can. I feel I've gotten over the hump that you need to cross but I'm not much beyond it. Don't fret though dude ! I think you've got the skills to move ahead.
The short answer like Teh Lurv above says - don't hit buttons when you don't expect them to hit and when you do , choose the right ones. There's a lot to learn in this game and it never really quite stops because you can always try other characters out but you gotta start somewhere.
An unfortunate side effect though... when you play against your friends you'll have to start handicapping yourself a little bit. OR , make a goal for yourself. Try and get a perfect , if you're using ryu, Parry every single projectile and jump in and follow up with a counter attack. Give yourself a challenge in other words.