How do you get over your appearance insecurity?

my brother's crush is all sad and mushy that she's not pretty enough to find true love and his attention to her and praises ain't changing her mindset. ik because he sent me a screenshot of her insta story. he's asking for my advice. the problem is, she doesn't sound superficial this time

she is kind of average, which is the end of the world if you're a girl coz people are crazy about female beauty. i kind of get it, as a fat girl myself, i can still get men but there's still a gaping hole inside. so yeah I don't wanna let my brother down, say something wise and cool

How do you get over your appearance insecurity?
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