It's normal and part of the magic of woman :-)
You probably have a yeast infection.
I am a man and just wanna say dark labia minora/majora isnt really a turn off so girls, dont worry about it. I noticed that some women who shaves often tend to get darker labia majora than women who doesnt. It seems shaving damages the skin which causes it to darken. Again from my point of view, natural women are sexier. I think it would be better just to trim the pubes rather than totally removing it and get darker skin.
I thought mine was gross too but once I took a leap of faith and allowed my ex down there with lights on, he can't get enough.
It's more about with you do with it and if it's clean. He didn't care about the color, nor does my current man.
Don't let mainstream media and porn set impossible expectations. They are ALL different, just like the rest of our bodies.
I am 58. and well postmenopausal. I was always pink. Now the labia minora are a purplish brown. I think for me it was the hormonal change of menopause.