I tend to be overly verbose sometimes but anyway here's what I imagine that it's like for me to have autism.
I live in my own little world by myself but I don't get lonely much. I prefer to be by myself because my world makes more sense when I'm by myself. Maybe this is lonely but it is also comfortable.
I have motor tics and that was one of the main things that I was trying to figure out when I stumbled onto autism. It can take a long time when I go to bed for me to stop tweaking out with the motor tics and actually fall asleep. I hate it. Motor tics are the worst but I'm very grateful that I don't also have vocal tics.
I have sensory "issues". That is to say that my sense of touch, sound, sight, motion and other things goes a bit haywire to the point of being irritating and difficult to deal with but sometimes the sensory "issues" can also be delightful. I feel textures more than I should. I feel my toes in my socks and the seams of my socks against my toes more than I should. While these sensory differences can be problematic sometimes, I also enjoy some wonderful things related to how I experience the world around me that I imagine most NTs are not even capable of noticing. Sometimes my sensory "issues" can be wonderful and other times they are irritating beyond words.
I apparently have a "super power". I love all the childish attributes that are applied to autism - super powers and special interests and what not - that's not my super power though. My super power is my perceptual reasoning skills which I'm told by my psychologist is way beyond what most other people are capable of. That's neat I guess. Not sure what I'd do without it as I've never been without it...
The hyperfocus that I can experience is amazing when the circumstances are right and it is allowed to happen. I can get so immersed into a task that I'm working on that I can literally forget every thing around me. The only thing that exists to me in that moment is the elements of the puzzle I'm working on solving. I can even forget how to understand vocal communication when someone interrupts me. This is like a whole different state of mind that I don't have words to explain but it feels amazing and makes me far more intellectually capable than I am in a normal state of mind. They don't test for hyperfocus on the autism test but I would say that this is my real superpower. It has helped me many times as an engineer.
I don't understand my emotions. I know now that this is called alexithymia. My emotions are like a broken toy that is fun sometimes but mostly it just won't work in any way that I can understand and this is frustrating and isolating. Also, this makes social interaction more difficult because I don't remember to think of how my words will affect others.
About the social interaction, I'm bad at it! I miss social cues and can't read peoples intentions and generally feel like a little kid hanging out with the grown ups. I understand the words they say but don't understand why they talk about the things that they do. The things that most people chat about are not interesting to me at all.
Also the anxiety and depression that seem to be best friends with my autism, they make things worse for me. Thanks to the alexithymia, I didn't even know that I was depressed until fairly recently. I just experience this as generally feeling bad but not knowing why. Now I know that bright lights and soft music can help alleviate the feelings of depression. Given the state of the world, I imagine that everyone has anxiety. Maybe this is not even an autism thing any more.
What is it like to have autism? I can't answer this as I don't know what it's like to NOT have autism. I can't complain though, I do alright. Also, my brain is amazing!