Questions: Health & Fitness

Thick legs/thighs doesn't mean she's fat🤔😏

Bruh I just found a lump in between my butt cheeks
I’m not sure which kind of lump, though
I also found some hair there, too

I'm 83 pounds at 5'0, which is a BMI of 16.2, which is on the verge of the "starvation" category according to the World Health Organization.
But as per my calculations, my waist-hip ratio (WHR) is.83. Apparently that's the average WHR for a woman, but apparently that's classified as "overweight" or even "obese".

The average woman is overweight so that makes sense for the average woman, but literally nobody can tell me that 83 pounds is overweight & that I need to lose weight to be healthy.
But apparently a large part of the connection between WHR & poor health is due to heart disease. Heart disease runs in my family VERY, VERY badly. Could that be the reason my WHR is relatively high? But I'm also sedentary, so maybe that's a factor?
If you're not fairly certain that you know the answer, please choose the first option. I want input mainly from people who know what they're talking about.

Im 5ft1
And Im currently 160 pounds

Which range should be ideal for me?

I've heard people say that vomiting feels good because it relieves the nausea. Personally I think it feels awful regardless, and I would prefer nausea to just go away without needing to vomit in order for it to do so. How about you?