Really black skin between thighs and outer vaginal lips.

Hi, I;m 15 years old and I have suffered with black skin on my inner thighs and outer vaginal lips and it's so embarrassing. I have tried lots of things like : Symba cream, cake soap, 2 different sets of lightening treatments at two different spas and hair bleaching. I feel so embarrassed that I can't even wear short pants or much less a bikini...All my friends have clean, clear skin. I tried scrubbing it and wiping it and it makes it look as though I do not wash clean which in I really do. It looks really dirty and I don't want to get older and be embarrassed to show out my body to my partner or be a model or anything because of these embarrassingly black areas. PLEASE PLEASE PLEASE can someone suggest something that is VERY effective..I am in dire need of this. Thank you so much.