How to feel comfortable about being skinny?

I have a fast metabolism (thanks genetics) and both of my parents are skinny, and I’m pretty sure their grandparents were skinny too. I’m 13, and I’m 5″7 and 93 pounds. I’m stick-thin and I can’t gain weight, and I’m completely flat chested. I already got my period, but I haven’t filled out at all like my friends did. My mom and my grandma from my dad’s side has pretty big boobs, so does that mean I’ll have big boobs when I’m older? I get teased a lot at shool for being flat chested and skinny and I don’t know what to do about it

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