I should probably add this:
I have been taught that we must look for the reason(s) behind a certain behaviour. I mean, social phobia/anxiety is something I don't stuggle with. I do find some social situations really dificult. What I can say is that exposure training like they do in CBT won't be very helpful in my case. For me it is ASD and not anxiety that is the issue. Here I need to say that you can have both ASD and social anxiety at the same time but it seems to be not that common.
Anyway, I am sometimes detail-oriented and have been called a perfectionist. I had a piano teacher who told me that I am a perfectionist. She never 5old me how she defined the term but I don't think she was right.
When I talked with an expert in ASD he said that it is not perfectionism. People just need to focus on different things.
I sometimes get stuck due to detail-focus.

"Perfectionism is often defined as the need to be or appear to be perfect, or even to believe that it's possible to achieve perfection."
goodtherapy.org/learn-about-therapy/issues/perfectionism

"Perfectionism is basically the flip side of catastrophizing, with a side of control freak. Let’s face it–not a positive character trait."
musingsofanaspie.com/2013/11/11/practically-perfect-in-every-way/

I do think that one can have both ASD and perfectionism but that's not me.

I don't really care about being perfect. I find it ok if I am not prefect. I just happen to get stuck when I see some details. It is more about how I understand details.
I am no expert in this subject.