No one gets it

I just had a long argument with my roommate about how she's so much skinnier than I am. She doesn't see it. She's so beautiful and thin and I'm not. I want to be as skinny and beautiful as her. The scary thing is that I don't know if she really is skinnier than I am or if it's all in my head. I eat just as little as her, sometimes even less, and yet she's always smaller than me. It's like I'm running a race that I can never win...