You could be talking about me. Job, kids, friends etc.
I work about 20h a week, simply cannot cope with more ("cannot cope" looks like total inability to concentrate or complete any task and likely self-harm or extreme anxiety if I push it).
I'm self-employed and do very well, but I crashed out of every employed job I ever had despite giving it my all - in hindsight I think I couldn't cope with the stress of my (simple) commute and the noise of the office.
People who know me would say that I am great with people - at work I lead a lot of volunteers and I am very good at reading people and placing them in the right jobs, engaging with them in a way that puts them at ease. It's because I am very tuned in to people's reactions/expressions and react to them more than most seem to. That's decades of masking for you.
Likewise friendships - I thrive on routine so I happily see the same friends every other Tuesday at 7pm but go to pieces when the holidays or whatever else changes things. I am very rigid in my thinking despite trying my utmost to adapt, be flexible etc.
There's lots more - personal hygiene is a disaster, for example. Significant issues with clothing. Use the same cutlery/crockery daily and can't tolerate others. Can't use loos outside of home. Lots of stims. No one notices any of the above.
Level 2 autism diagnosis by a reputable assessor, plus ADHD.
From the outside I am successful, together etc. I would be the last person anyone would assume had autism.
Since I'm on the thread again I would add - autism isn't a spectrum like the knob on a cooker, it's a spectrum like a light array or circular graph representing various skills and attributes associated with autism. And one autistic person won't be the same as the next. This graphic explains it better than I do: https://ablelight.org/blog/why-the-autism-wheel-is-replacing-the-spectrum/
Now clearly if someone has poor speech and hypersensitivity and tics and and and, they are going to be more obviously autistic and will be much less able to adapt to NT society and function within it, but that doesn't mean that someone with a more moderate profile isn't autistic.