Most people are arseholes.
That includes you and me.
I'm also in my mid-20's, I haven't been diagnosed with clinical autism, but that was one of the ideas they tried to bounce off me en route to deciding I had "Ptsd".
I think, people don't really have innate personalities as such; only formative experiences and situations that they are placed in.
I wouldn't go so far as to say that the human soul is "Tabula Rasa", but before experience, there's only that a-priori framework presumably instilled by your genome.
If you put a person in a situation where they suffer intensely, then they will act like an asshole.
Modern society basically gives you two options; toe the line or eat shit and die.
When an adult comes to terms with this, it can ruin their outlook forever., especially considering that we all seem to be inescapably trapped therein.
I myself have been cast out by my family, but I also found that cutting them out of my heart was the best thing to do.
They did not want me, so what need had I for them?
Being close to them made me miserable, but so did being parted from them; I had to come to terms with the absurdity of this situation, and opted to embrace separateness.
Now my mother tries to send me money every christmas or birthday, and I tell her no, and that her money is dirty, because she won't even look at or talk to me.
One day she'll probably stop trying; then I'll know I've won, and that her heart is broken.
I guess there isn't really any such thing as an asshole; just bad winners and sore losers.