I have a friend who is like this:

She doesn't like anything, she obsesses over it and wonders a lot why she doesn't like things or most people. There are faults with everything. Everything is "stupid".

She does not understand how friendship works. She don't understand reciprocity.

She feels God has given her a too rough deal when in fact God should have made her life easy and good. She obsesses about going to hell.

She does not really change for others but if she gets obsessed with anyone she can be really hyperactive and hyperfocused. When she wears the person down her obsession does not fade as they slip out of her life, her focus is intensely on certain people that should be there whenever she wants them.

She speaks and types too fast and messes up whenever she talk to people. They can't follow her train of thought. She jumps around over and over, she monologues at people just not to listen to any reply and not caring if the other part wants to stay on topic.

She can't focus on one thing for a long time. She can sometimes do one thing for a few hours, play with a new app or something. Else everything is boring and she stops doing things before she starts. She hates being told what to do. She goes to extremes to be able to not do a task, she must do it because she wants to, but she never wants to anyway.

She has a few friends, but she finds faults in them and obsesses about the faults. Also she gets very angry if the friend cannot be there when she wants the friend. Mostly, the friends finally leave.

Sound always is too loud for her. She is sensitive to loud sounds.

She laughs at things that are about other people getting hurt.

She never helps friends back, she uses them up, they are there for her, she doesn't even acknowledge they have their own lives outside her life.

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My friend is yet to be diagnosed, but I am pretty sure some of her issues are in the autistic spectrum despite her being superficially very outgoing, and goes into hibernation if she doesn't have people with her around the clock.

While the OP seems of intelligence and some understanding of other people's inner life, my friend is of low intelligence and has no true understanding of people's inner life, neither affective or cognitively.

If she had been in the UK, I am pretty sure she would have been diagnosed PDA.

I don't think my friend has any psychopathy, but she is very, very selfish and always puts herself first. I think that is partially because of some form or narcissism that I don't know how it fits in with all this, and partially because she is the center in her own autistic universe. Because she cannot feel other people's pain, they don't feel the same pain she does. She is fully convinced of that.

The main thing is IF there is something autistic going on, it doesn't HAVE to look like either classic aspergers or classic autism. There are many variants.