Autism was merely something never discussed when I was a kid. I don't recall there ever being a stigma. As such, the signs that I was autistic never really got caught until I was in my twenties. Firstly a couple of people I knew had family on the Spectrum and mentioned that I showed several signs. Then a couple of years back my cousin, a psychologist who spent several years working closely with autistic adults said that in her opinion I was definitely autistic. I haven't been formally diagnosed, though I'm currently considering it.
I find my interactions online in general and MU's, in particular, are a mixed bag. I struggle with making connections with people but find when I do they're easier for me to maintain than IRL relationships.