I’m jealous of how skinny my sister is? How do I stop?

She is just so skinny and she has never even played any sports. I go to the gym 3 times a week and run every day and I’m still bigger than her. Her stomach is so flat every time she wears something tight I get jealous cause mine sticks out so badly. She is starting volleyball and she is going to get even skinnier... show more She is just so skinny and she has never even played any sports. I go to the gym 3 times a week and run every day and I’m still bigger than her. Her stomach is so flat every time she wears something tight I get jealous cause mine sticks out so badly. She is starting volleyball and she is going to get even skinnier this isn’t fair. I’m 15 and she is 12. Should I workout more?
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