I've had the opposite issue.
Single working mum, 10 years between my brother and I, so often left babysitting in my teen years while our mum worked.
Had to nip to the shops a few times, take buses, go to appointments, basically be a mini-adult and independent, all with my brother tagging along.
Have been asked by many people if he was my son. I was absolutely horrified that the default assumption was that I gave birth at 10 years old, and it caused a lot of bother when I objected to babysitting so sometimes I had to suck it up because there was no alternative but I felt really shameful, like at best people would have been envisioning a SA encounter, or at worst, been slut shaming a teenager with a 3, 4, 5 year old in tow out of necessity.
It carried over to when I was pregnant with my son, had already moved out, lived with a long term partner, that when I announced my teen pregnancy at the grand age of 24, I'd get a scolding and people would think bad things of me. At that moment in time I did feel as close to what you could assume feeling trans-age could possibly feel like.