Do I even have autism?

Ok so I was diagnosed with autism spectrum disorder at 16. Prior to my diagnosis no one even knew I was different aside from my intellectual impairment which I only had in learning. I spoke to a girl the other day who is on the autism spectrum and was diagnosed at 22, she told me all her life she felt different and felt she couldn’t relate to other children. And it got me thinking, I never knew I was different, never felt different and I could relate to other children who were either my age, younger or that had disabilities. I related to everyone and was friends with anyone. I went to school camps with my mainstream school and always did fine, most people who have autism spectrum disorder have difficulty with change, I never had issues with change. I actually enjoyed change and have always loved to try new things. Between the ages of 17–19 I was overly shy though, and wouldn’t talk to anyone and was seen as rude by some people. But after I turned 20, I’ve became quite extroverted and I love talking to people and want to do things with my life. I’m just confused as I’m not sure if I even have autism spectrum disorder so if any of you could answer this I’d really appreciate it, thank you xx.