You know what would be normal? Having had a medical at some point in your 19 years of life.
If I have a concern about my genital area (this is Ask a Woman, don’t ya know), at my yearly medical, I say, “so, Dr Jones - is it normal that my vaginal area has turned black and started quoting Shakespeare?” Or something to that effect. I just had a medical last week and I had a ton of questions that I listed - whenever one occurs to me, I put it on my phone and pull it up at the doctor’s office.
You might want to try that. Ask your doctor. Or ask Google.
LMGTFY