How can I be a C cup but not look like it?

My bra size is 32C, and I know a C is fairly big. It's definitely bigger than a lot of my friends' Bs. But I'm really petite, and slight so I don't understand why they're that big! And they don't look it either. When I wear tops, I don't have any clevage, and have to wear a push up bra to get some. I know I definitely am a C because I was measured, but it just doesn't make sense!
How can I be a C cup but not look like it?
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