What were your first signs of autism that you remember?

I'm not diagnosed and don't actually believe I have autism, but a lot of people in my life seem to think I'm neurodivergent and I definitely have some autistic traits, so I was wondering if my own experiences are similar to those with diagnosed autism. I will be getting myself professionally tested at some point by the way, so don't worry about that.

What are some things from your childhood and even from adulthood which stand out to you which appear to differ for neurotypical people? What made you/people around you realise there's something different about you?