You should not worry about whether you win or lose with these players. All three players in the videos have more experience. The little kid, in some ways, he is the best player in all the videos. The girl is older and more experienced. But the kid has more solid attacking shots from both wings. If that kid lost to your opponent in the first match, it was probably not the usual result. The girl just serves you off the table. Don't worry about that. At some point you will know how to return those serves.
Some positive things: you have a great attitude and don't seem to let it get to you when you make mistakes like missing a serve. Keep this. It is a great attribute.
You do come up with a few really nice shots. Several good BHs a few nice FHs.
What you need to work on:
This is really the main thing worth mentioning in my opinion. You need to learn to make spin contact and spin everything. Most of your contacts are fairly flat. On serves, on pushes and on attacking shots, you are not making true spin contact. As a result, your attacking shots are very low, and close to the net. Also as a result, if you are a little too high, your shots go long and if you are a little too low they clip the net or go into the net.
You need to learn to generate enough spin so that your ball can pass 10-50cm over the net and arc onto the other side. Watch the little kid. Notice how his ball is aimed a little up and it curves down to the table. You need to do that.
These next things are not so important but it is worth addressing them sooner rather than later.
1) You are tall. Your arm is long. Why do you spend so much time in the middle of the table taking the ball with your BH? Learn to cover 2/3 of the table with your FH. You will still be able to use your BH effectively. But you rarely get to use your FH because of how you position yourself.
2) a) Pretty much all of your serves are technically not legal. When you serve, the ball is supposed to be flat in your palm with your fingers spread and not touching your fingers. You are holding the ball with your fingers.
b) You are supposed to have a moment when the ball is completely still and you are presenting the ball to your opponent. Your hand never stops moving before you serve.
c) Sometimes, during your toss you drop your hand, and the ball below the table taking the ball out of the site of your opponent. This is also against the rules. You have to keep the ball higher than the playing surface.
d) You miss way too many serves. Missing more than 1 every 20-30 games is okay. Missing 4+ every game means you need to practice serving a lot until you miss fewer serves.
Those are all easy to fix. At your level, it does not really matter. But, as you get to higher levels, those things will start being used against you by your opponents (mind games) and will also start being called against you. None of them really matter in the large scope of things. But they will cause you some grief when someone starts calling you on them. So I would fix them now. Easy to fix.
That is Ma Long, set and paused before serving. Note, his forearm is resting on the table and his palm is behind the end line. This ensures 1) that the ball cannot go below the table, 2) that there is a pause where the ball is still, 3) that he is low before serving, and 4) that the ball stays behind the line before serving.
That may not be how you should do it since you are tall. But if you watch the opponent in the first video, he does this.