I think your biggest problem is you think that this game is like Call of Duty or some other game where your going to be a super star after a few days practice. Nothing is farther from the truth. There are far more "controls" to learn, once you have them down, then there is learning to fly your plane. It's strengths, weakness and just general controls. Then there is learning the other planes, and what they can do. Then there is how an opponent flies when he's on the attack, and how he flies when he is defensive. Then there is how you can use other friendlies and/or enemies to get your kill. Once you get it through your head that all this is going to take awhile you might progress a bit quicker, not much, but it will feel much quicker.
The LA film, you were flying WITH a squad. you should have never engaged that LA. Dive down to meet him, make a merge (yours was ok), but zoom back up to your group. The "team" may have been counting on your ord to help do the job to complete the mission. When in a mission the mission objective is NUMBER 1, not the kill.
The G14 fight, you were so set on jumping the low cons that were already out numbered you gave the 109 your 6 starting the fight at a disadvantage. With all the other planes in the area, had you ignored the low guys, kept your alt and run a lazy nose up turn in either direction, you would have been in a stronger position. Most likely the 109 would have been distracted by another "easier" looking target giving you the chance to be the high guy looking to pick him off of someone else. Instead he had the upper hand on you. You pushed for a low percentage shot leaving you low on E again. All that saved you was the friendlies in the area looking to pick him. Most 109s are flown by decent sticks. The 109 is not for newbs, so you can be pretty sure that a 109 is going to be pretty good. You may have read that when your fighting more than one bad guy the best thing to do is to try and lead them around to get them ALL in the same air space. This way your defensive moves work on all of them at the same time instead of trying to string a bunch of moves together. If thats true for the defender, what would be the plan for the attacker? NOT to get in the same air space as the others. You followed the other guys around and tried doing the same turns to get the same shots. The 109 did well avoiding you all for awhile. Had you let the other guys do the chasing you could have gotten a bit of alt and dropped in on the 109 by watching where the other guys were pushing him and flying to where he was going instead of chasing him.
The P47, P51s film. Again too fixated on the target. You gave up all of your advantages by pushing for the kill on the P47. Even once you got the "check 6" you still took far too long to figure out which pony was the threat, and decide what you were going to do with him. You were in a bad way, and should have known right off that flying strait and running wasn't going to work. Turning back into them over and over again would have got them slow where the flaps and counter rotating props of your 38 would have given you the edge in a slow turn fight. Had you been able to survive gun passes from them a few times (point your wing tip at the one that is going to fire at you, 400-600 out, smallest profile, less to shoot at) the guy that had given you the "check 6" may have come back down to pick one or both of the ponies.
Well thats my humble opinion. I'm no super stick even though I've been here 10 years. Thats the best thing about this game, every fight (against someone who tries to fight) is a different animal. While one move might work on one guy, the very next fight with a different stick won"t work the same. The best advice I can give you is don't worry about the kills or dieing. Learn the fight, learn how to be a team player even if your NOT flying with a squad. Working off/with other players in your area very much dictates how a fight can go. There are a million things you can learn in this game should you want to. Your not going to learn them and get good at them in a week or two. Give it time, ask questions, take advice and learn from it.
