Living for now NOT later!!

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So I have this family member who pretends to be all supportive. However everytime I mention getting pictures made or buying new jeans she say's "why don't you just wait until you lose all of your weight". I am so fed up and it is actually causing me to eat more. I feel bad about myself and I can't just snap my fingers and be thin. I feel like she is embarrassed of me. We all went wedding dress shopping and she told the lady "yea he loves her inspite of her weight". GRRR! I am a nice person, I care about everyones feelings why say those things? I want to be happy with me no matter what the scale say's. I don't know what I should say to put a stop to this. Hardest part is she is my boyfriends aunt so I can't be harsh. Am I just being over sensitive?