We were at the university. Freshman year. I was focused upon my studies and athletics. I was busy and had people around me, a roommate, teammates, classmates. I had gotten a job on campus on the weekends. Sure, I had people around me, I was out and about, but I wasn't really into all the social activities on campus. Keep in mind, this was before computers and mobile phones. If we wanted to do research on anything, it meant a trip to the library and sitting with other people. People in my generation just couldn't physically isolate ourselves, not at a university. For the most part, I was and still am a bit disconnected from the people around me. People are "things" I navigate around in my daily life, so I am not paying attention to all the communication signals people are giving me. So it is with women. Certainly, I am attracted to women, I know they are there, but at the same time, I am often navigating from point A to point B without allowing myself the distraction. So, seemingly out of the blue, comes this beautiful young woman who actually had to do a bit of work to get me to pay attention and notice her. I was clueless, until I wasn't.
As far as your second statement, I still hold to my advice. The real world is where you have to navigate this, especially for an autistic. Sure, you can meet people through dating apps, but then what? If you are in the habit of isolating yourself from the real world, and they aren't, the relationship will crumble before it even begins.
I am married to a neurotypical. She is a social creature. Which means, as her partner, I cannot simply say, "You go and have fun." This is not how marriages work. Her family and friends begin to question things, then she begins to question things, and the next thing you know, you're by yourself again. In other words, I am obligated to be her partner in everything. I can socialize for a short period of time. I have enough stamina for that. Then, I will find a quiet corner and read. I am listening to the conversation, out on the periphery. I am present. She knows my limitations. She understands. However, if you're not willing to be a life partner, in everything, then don't complain when you can't find a partner, because at that point, it's nobody's fault but your own.