Check out the Betty Dodson website. She was an artist who got interested in all the different ways women looked in the labia area and did a set of drawings for an art show, and the show was overwhelmed with letters from women asking if they were normal, how to masturbate, and other subjects. She subsequently got her doctorate, I think, in an area related to gynecological issues, and there is a site now with her name on it that has interesting drawings of how different women can look 'down there.' It's worth seeing if you think you look "saggy."
Labial lips on a mature woman (versus a child) look much fatter and stickier-out than they did when she was a child. They've been described as a hamburger bun with fat lettuce sticking out. This is normal, not "saggy." There is surgery that can be done to remove the labial lips. It is very painful and not beneficial to the woman unless she intends to grow up and become a porn star. It is designed to make full-grown adult women look like little girls in the genital region (the surgery along with shaving their pubic hair). The fact that porno purveyors think it pays to make their female stars look like they have the genitals of little girls is worth wondering about ... are there really that many men in the world who secretly want to have sex with underage children? Or is it just that a few women in porn did this and it set a porn fashion, and then suggestible women out there in the general public bought into out of insecurity? Never let a porn star's appearance shame yours.
I'd say your genitalia is probably normal looking, and all the girls your age (who are maturing at different rates now) will look more or less like adult women by the time they are 18, and that will include normal genitals. Try not to worry, men LOVE labia. If they are ever in the happy position of looking labia in the face, they are not doing an aesthetic critique, they are thinking they are lucky.