I feel not pretty...

I feel very not pretty compared to girls my age, or even older than I am. Everyone seems to think that small boobs = perky and that youthful = perky. Well, not me. I'm 17, have C cups, and my boobs are nothing close to perky. Even as I was developing, my boobs were not perky, and they've only gotten worse with size. My nipples sit at the bottom because they just go downwards. Instead of being a nice circle, my boobs are like an upside down tear drop and all of the fat just hangs at the bottom. It makes me feel really insecure when I see my friends take off their clothes and they ask me why I won't take off mine in front of them, or when 70% of young adult women vote that they have perky boobs, or when I hear things like "small and perky", or when I sit down with no bra and my nipples touch my stomach. I feel very insecure about myself and I just needed to let it out. Thanks for listening