The phrase "dress for the body you have" applies to everything... hairstyle, makeup etc. You'd be amazed how much a change in hairstyle can shape how we perceive someone's face. Even genuinely ugly people can at least attain a reasonably acceptable aesthetic if they style themselves tastefully. Maybe you should consult a stylist for advice on a hairstyle.
It's sort of like how optical illusions work. An artist can make a certain arrangement that can make you think something is moving, or something is a different shape than it actually is, all because of the way it is presented. Likewise a tasteful choice of glasses/hairstyle/makeup contours can drastically change the way you look.
To be frank, Kpop is a shitty hobby for someone with self-esteem issues regarding their appearance. The Kpop world glorifies perfect barbie dolls who have all had plastic surgery and don't eat enough in the name of attaining an impossible beauty standard. I've gotten Youtube recommendations before of these "fat tracker" videos with titles like "A history of Twice member X's weight loss/gain." The video ends up just being a timeline of pictures where the person looks exactly the same in every single one, and a narrator is saying "here she gained some weight, here she lost some weight" as if these near-invisible microscopic details make any difference at all. I like Kpop for the music videos and the fashion but I also recognize that it can be a little cancerous in this regard and maybe for someone like you who seems to have serious self esteem issues it isn't the best hobby right now.
What's more, i9son is right. If you come in asking people for help, and then shame them when you don't hear what you wanted, you're going to look like an ass and drive people away. That can definitely influence how many friends you have. I've known plenty of popular ugly people. Honestly physical attractiveness really only matters if you're looking for a boyfriend/girlfriend. For platonic friends you really only have to maintain good hygiene and be cool. I don't personally give a flying shit how hot my friends are, I want them to make good conversation and be respectful, cool, and considerate of my feelings. Now if I'm looking for someone to sleep with, that's another story, but even then, personality matters as much as looks. I've dumped very attractive girls because they had a personality that didn't gel with me and I've been into girls with obvious physical flaws because we connected on an emotional level. But you gotta be cool and try to be nice, honest and fun to be around... NOT complain that it's impossible before you even try. And when you inevitably do something cringe, you gotta play it cool and get back up again. Cause you only have one life, and time and aging won't wait while you lick your wounds.