Boobs boobs boobs

so recently I’ve been hanging around my female friends, I’ve notice we definitely don’t look the same, for example, their boobs are perky and they have nipples that stick out. My boobs are slightly more saggy and have flat nipples. I’m very very very self conscious about this and I really just don’t know what to do. Is there any way to make them more perky? I’m 16 by the way