How did you guys find out you're autistic?

Here's my story(according to my mum):

When I was about 5 and a half, my elementary/infant school teacher noticed I was different from the other kids. During circle time, I would sit away from the dancing and singing and I would stick pencils through the hole of one of those weird tables with the circular hole in the middle. I would also be very monotone (According to the diary we got about our Reception/kindergarten year, I did the most robotic spelling of the word "Zip" you'll ever hear).

Soon enough, I was taken to a paediatrician and a speech therapist where they diagnosed me with (at the time) Asperger's and ADD. Since then, my diagnosis has been refreshed to the modern terms (Autism and ADHD, or AuDHD).