Flat nipples?

This is something I'm really insecure about, but my nipples do not stick out at all..not even when I'm cold or aroused. They aren't inverted, I know this because I looked up photos. They're literally flat and I know when they're hard because they feel different but they literally never stick out, sure some people may think that's good for certain times but it makes me feel inscure, kind of less womanly if you will...are flat nipples normal lol, anybody else have them? If so how do you feel about them?😕