How to boost my self-confidence?

I'm always jealous of other girls, and how perfect they look. I've been called ugly by my cousins, and it doesn't help that I'm skinny and trying to gain weight. I have a high metabolism, so it's almost impossible. How do I boost my self-confidence and ignore the rude remarks that my cousins make? Sometimes I think I'm just sensitive, but I don't know..I'm just going through a lot right now, and my appearance is really bringing me down.
 
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