Large boobs

Okay, so this is my first post, I am 24, & I've been overweight for most of my young adult life, & always been a big girl.. I've been super self conscious about my boobs, as they at big, but kind of "saggy" & I feel like I don't have the right "nipples" if that makes sense.. They don't seem to stick out even when I'm aroused, & its embarrassing... I've been talking to this guy lately, & I'm nervous that when it comes to sex etc, they aren't going to be attractive to him... 😩😩😱