I feel similarly.
When I started my periods I was completely unprepared. Mum had never spoken to me about anything like that.
I was very embarrassed but managed to get the words out to tell her after school. She was stony faced as usual, and presumably also hugely embarrassed.
She gave me a massive box of own brand, ugly, unwrapped sanitary pads that looked more like what I now know to be maternity pads.
I balked at this, as they were so unlike the really prettily wrapped ones the girls had at school. This was the late 90s and the latest ones were the ones wrapped in paper that wasn’t crinkly, so people wouldn’t hear you unwrapping them in school toilets.
I asked if we could go the shops to choose some. She took me to the shops and she stood, uninterested and disapproving looking, at the end of the aisle while I looked through them all myself.
she bought the ones I chose, without comment. But from then on, occasionally after she’d been for the big shop, there would be a pack of the big, ugly own brand ones waiting on the stairs for me to take up to my room.
I found this really cruel because she obviously did it knowing I would be too embarrassed to raise it.
I couldn’t bear carrying them around in my pocket at school so I often went without and just used toilet paper.
I can remember, years later, she made some inappropriate and catty comment about knowing I wasn’t pregnant as a teen because “she washed my underwear”. 
Now, my daughter isn’t yet at that age, but if I noticed she consistently had blood on her pants, I would have a chat about how to use sanitary pads correctly etc, find out what was going on.
The whole way she went about it was just awful. And as you say @3luckystarsits only now that I have my own kids I can see just how neglected I was.
my eldest is 11 and I’d say since he was around 7 or 8 it really hit me just now little my mum did for me at that age.
My mum worked (part time, civil service) and was outwardly very respectfable. Always smart, noce
suits, make-up. Whereas I was dressed exclusively in hand me downs, she didnt check if I washed or brushed my teeth so ended up with very bad teeth which have needed a lot of dental treatment over the years. I was born with a birthmark on my face, not a particularly bad one at all, but from a young age it bothered me and I used to try to cover it up. Initially with talcum powder, then with horrible thick, orange Pan stick which I pinched from my nans make up bag. So in primary school I either had talc plastered all over my face, or orange pan stick slapped on. It looked dreadful. But she never spoke to me about it or the birthmark or offered to help.
I also had very unruly, frizzy hair. I used to tightly braid it and slap on hair gel so that when it was loose it was sticky and stiff and just awful. I would only wash it once every few weeks as it was so jard
to brush due to the gel. Again, it looked awful. Again, she said nothing. Since my early 20s I have worn my hair very short because I just can’t bear the thought of dealing with that again (irrational, I know).
I could just cry when I see photos of myself at that age. Particularly compared to other, well looked after little girls.
It made me very jealous of all other kids although I could never really articulate it.
Have never been able to figure out what my mum was thinking. She seems to exist in her own little world so I do think there is something not quite right with her. She would be shocked and offended if I ever mentioned any of this and would lash out and somehow try to say it was my fault.
Don’t think I’ll ever get to the bottom of it.