What Causes Genital Skin Area Darkening And Itching With Dryness?

Good day doctor! I am a 21-year old girl/woman and have been living with this stigma for over 10 years now. I had never engaged in intercourse before. It started out as an itch on the labia majora area and being ignorant about it, I NEVER turned to a doctor up until now. Once my vulvar area matched the rest of my skin color, even with the persistent itch remaining therein. But as I aged into puberty, that area eventually turned darker, until it presently is colored as dark-brown. The worst parts are: My genital area almost always itches so I had resolved to scratching, which at some point, even damaged the skin round that area. Presently, I am concerned about my feminine area since I could very well describe it as the labias being dark-brown, with dry, flaky skin (and some scabs from the scratching) and wrinkled all-over--like it had been atrophied. I do not have pain during urination nor a burning sensation, but a slightly yellowish and slightly thick (and sometimes it tends to be cheese-like or that with a faintly greenish color) vaginal discharge. And another thing: I would want to ask if it is related to my other problem which is constant lethargy. i do fall asleep a lot during classes, even if I have had enough sleep at night. It is really affecting my confidence and my studies as well. Please help. I know this has to start within me to get the proper medical advice but I am ashamed (the fact that I never told anyone about this problem..even my family) and I would want to rule out the possible confusing diseases that have the same signs and symptoms with my condition so that I may also know what doctor to consult. Thank you so much.