Well, you look like you are having fun and you like to swing BIG. So keep playing.
From a fundamentals standpoint, it looks like you could use work on the basic stroke, on counterhitting with a compact stroke and some work on control.
The technical issues that appear in the video:
1) If you pause and move frame by frame, your hip-rotation is not timed with your contact. Your hips rotate after the ball has left your racket which is part of why you are swinging so hard and not transferring that power into the ball.
2) Your elbow moves to much and sometimes it goes up too much.
3) The followthrough of your stroke ends with the racket across your body, to the left of your left shoulder and lower than your left shoulder. Ideally your followthrough would end at about your mid-line. And about the height of your forehead.
In the match play, it is too bad we don't see any points where there is over the table play and it is too bad there are no longer rallies. Most of your serves in the video were long topspin that your opponent was not ready for the placement was interesting because you telegraphed where the serve was going and a better opponent would have punished that serve. But you opponent was consistently not ready for a ball going to the exact same place in the middle of the table.
In this video there is one serve you do that is backspin. But it is light backspin and the serve is long and high, so, pretty risky. But, you got away with it with the guy you are playing.
On receiving serves you demonstrate an ability to loop or push long backspin. So the video shows you are competent to receive the serves you were given.
In spite of the editing, it seems you are probably a little higher level than the guys you are playing in this video. So it would be interesting to see footage of you playing someone higher level or even someone who is actually your level. The guy you are playing the match with may be closer to your level than the warm up partner. But he has trouble receiving serves and adjusting to random placement when receiving serves.
None of this matters too much. Keep playing and having fun. You are quite good for being self taught. And the more you play the better you will get.
This video is care of NextLevel. This is some of the information you need to help your forehand improve:
Sent from Deep Space by Abacus