When did you become aware ...

Family holiday as a young teen - raped by a local bar man but family didn't want to report to police as thought it could put me through even more pain and result in nothing happening to the guy. This was around the time of a high profile suicide of a young girl in the uk who was raped then made to go through a really horrible trial where the defence lawyer made her hold up her underwear in front of the court. I can understand why my family didnt want to take it further.

Coco.
I want people to know that females can be a threat as well.

Mine was a fairly late awakening. On gap year pre uni round Europe being groped by strangers on trains, chased down roads, flashed at on the metro etc etc. Endless harassment.

Vicky how incredibly unlucky for your brother and for you that your aunt was apparently one of the tiny little proportion of offenders who are women. I'm sorry that happened to your brother.

But OP's question was about when you realised the reality that the world you live in is a hostile setting to move though as a female child or adult. You seem to have misinterpreted "not a female-safe world" to refer to a world in which female people as a class tend to pose a risk to children or to others. If such a world exists, it ain't this one, as i'm sure you know.

As soon as I had breasts and acquired loads of nicknames from boys, I was 9/10. Also it was that age when I went to a party and couldn't go to the toilet because all the boys tried to look under the small gap at the bottom of the door.

I was around 7 or 8. Some boys in my class threatened to strip me of my clothes if they saw me out ( this was in the early 1960s when all kids walked to & from school, played outside etc). I was terrified, told nobody even when I got into trouble for refusing to go to the shops for my mother. My intro to male power.

When I started secondary school and would walk an extra half mile there and back to avoid a house where a man would make disgusting suggestions to me as I walked past.

My aunt used to like touching my brother when he was about 12 and I was 10, that was when I realised that older women could do bad things.

Could have been the time a co-worker grabbed my boobs in front of everyone when I was 20 although I don't think even that made me realise that it was harder for women.

Mine was a little younger when we would do the weekly shopping. Although it was a warning that both girls and boys were vulnerable to harm from men. Myself and my sister were allowed to go to the public toilets but warned to leave immediately if a man entered. My brother was not allowed to go to the public toilet unless my father was able to go with him.