Is it normal that i have a mound on my pelvic bone, right above my vagina?

I noticed that other girls, that I've seen, don't have this mound like I do. It's kind of embarrassing because whenever I wear pants or shorts, I have a bulge. Does this have to do with weight loss? I'm skinny now, but the mound is still sort of big and squishy. Do any other girls have this above there vagina? Is it because my vagina is "fat"? Are they related in any way?