i think that if you are ugly, the only thing you can do is accept the fact that you are ugly and stop arguing about it.
because standing in front of the mirror every time trying to find some positive aspects of your appearance and deceive yourself with words like "i'm pretty" "i have an average appearance" "i can be liked by people" and maybe even convince yourself of your lies in the end, it will only hurt more when the outside world reminds you again of what your appearance is in terms of objective beauty, and your whole confidence will fall apart when someone tells you their honest opinion about how ugly you are, how disgusting it is to be around you, how even plastic surgery won't help you, and how totally unfuckable you are because you're so ugly. denial won't help improve the self-esteem; ultimately, everything will only get worse. there's no way out.
i once managed to convince myself that i had a normal, average appearance that didn't disgust people, but now i'm even more convinced that this is not true. i will never feel better, but now i know there's no point in forcing myself to think i'm looking better than people says i am.