Why so many girls lie about their breast size?

I am 19 years old and I have seen plenty of girls with an AA or A cup claiming they are a B cup or a big C cup. As someone with a 32B cup size I can guarantee you it looks pretty big and I am not a C cup but many of my friends thought this, while I measured multiple times and turned out I am a 32B. Why so much girls are lying? Having small breast is beautiful.

Why so many girls lie about their breast size?
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