I don’t wear any make up.
As a teenager i was pressured into wearing it by my mum- brighten yourself up, put a bit of lipstick on... she was always buying me lotions, potions, and make up kits. I always felt self conscious though.
I got into it a bit in my 20’s, but never wore it everyday. Nights out only, and I went for the overdramatic look, i loved experimenting with dark colours or metallics- more goth than “pretty”.
Now i don’t go out i don’t bother. I have found though i think i look worse with make up now, it sits in my creases and shows up dry spots, and makes my eyes look piggy.
In short i prefer how i look without make up, and i prefer the feel of clean skin. I also like not spending half an hour in front of a mirror each morning. 
It’s not about not being interested in my appearance. It’s about thinking i look fine in jeans, t shirt and no make up, and not feeling the need to spend hours trying to “improve” myself. I don’t think i need improving 