I'm jealous of my sister's breasts?

It's ridiculous! I'm 19 and I'm an A cup. She's 13 and wears a C cup. It's like whatever mom's feeding her I wish she fed me. When we go anywhere together I catch guys staring at her instead of me. One even asked her out not realizing that she's so young. It's not even normal for her to be so developed at this age is it? Is it too late for mine to grow? Should I just get over it and stop wanting to be like the little slut?
I'm jealous of my sister's breasts?
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