I had some issues and traumas growing up such as not having a father and witnessing domestic abuse (though overall a fairly happy childhood) but it really started to fall apart when:
>approaching the end of high school
>start to realise I don't really fit in or relate to any of my friends, or just get tired with people completely
>start to make excuses not to go out, just want to do things alone
>have no desire or motivation to achieve anything, get poor grades, browse 4chan on my phone in school at every opportunity
>high school ends and don't have good enough grades to go to university, have no interest in any field or career anyway
>mother pesters me to do something so do a random course I have no interest in at a local community college for 2 years to stave of wageslaving
>mother pesters me again after it is done so volunteer at a charity store for a year or so
>COVID hits and it closes, mother gives up and have been NEET ever since and haven't done a thing except rot

>virgin
>social anxiety
>probable undiagnosed mental illness (autism, AVPD)
>no friends
>no university degree
>no driver's license
>shortish, balding, skinnyfat

The only thing that doesn't make me a quintessential robot is admittedly I had two "girlfriends" in high school because I emomaxxed and wasn't ugly, though they were brief (neither lasting more than a few months), unpleasant and neither culminated in sex because I am unlikeable, probably autistic, and seem to have issues being close or comfortable with people. I'd actually rather that neither happened because they were truly miserable experiences.