I have autism and I was diagnosed when I was 16 (which is a late diagnoses) I don't think social anxiety and autism are the same thing. It's not that I get anxious during conversations it's more that I don't know how to react. I don't know how to show emotions, I have them but I can't show them.
I'm part of an autism foundation for adults and it shows how people with SAD (Social Anxiety Disorder) and people with autism are different. There are people with autism who can't speak, barely move, and some can't even move. Some can barely speak, one of my friends speaks through a wooden board.
The other thing is people with autism usually only have one passion. Which means they are more likely going to excel at that skill. Another thing that I noticed is people think people like me are "stupid" when really we are very smart! I am the top grades in my class. Yet I can not socialize like everyone else.
I have a life coach to help me learn basic skills, such as cooking, cleaning, socializing, pretty much any skill seen as basic I have a problem with so he teaches me.
Yet when it comes to intellectual parts I can do awesome things. For example I can remember anything, when I was being tested the psychologist asked me to draw a figure I did perfectly, about an hour later he asked me to draw it from my memory, I drew it exactly the same way and it was the best he's seen in 9 years in office.
I see it in every person at the autism foundation. They are people who want to socialize and share their minds, but they don't know how.
The thing about autism to me is, we may not be able to do basic motor skills or socialization skills. But we don't stop thinking, we remember everything, we look at every single detail, we want to do things right. It's hard to explain how our brains work because none of us are the same. Autism happens to anyone and it affects people differently. I'm lucky I can walk and talk, I think my brain is a blessing. I also think people need to learn more about autism and stop picking on someone because of their habits and socialization skills. I'm not really sure where to go from here if something is on your mind feel free to ask I'd love to help!