The following explanations of autistic experience are the result of a lot of research, thought, interacting with other autistic people and, especially, growing up as an unrecognised autistic person who didn't know why they were different. It was also a live tweeted stream of consciousness, only slightly reordered for clarity here.
Due to all of the above, my bias towards people with experiences similar to mine will be very evident. This is effectively the description of autistic experience that I wish I'd read and understood in my late teens or early 20s, rather than in my 30s as I am now.
I strongly recommend that you also seek out and read the experiences and perspectives of other autistic people with life experiences, personalities and traits different to my own. Here are good places to start:The Thinking Person's Guide To Autism
The Autistic Passing Project
Loud Hands: Autistic People Speaking