I am a 19 year old female, C cup and have had "inverted nipples" since I can remember. They've never been an issue until I started getting intimate - more embarrassing for me. They're inverted but when it's cold they come out and still don't look like normal nipples, they look as if they are cracked. I've heard of getting them pierced but not 100% sure that will work as they are "cracked"