In the very unlikely event that 'iamhopeless' will come here, read this, and actually pay attention to my words, I'll answer what appears to be a pained cry for help. (If anyone wants to pass this on, please do. I'm not going to that toilet myself.)
Your life has intrinsic value. If your parents failed to teach you what should be among the first lessons a child will ever learn, then you're right to be angry. (That anger does not, however, give you the right to mistreat others.)
Part of the reason why you are doing poorly in what I assume are multiple areas of your life is because - and this is especially true if you are autistic - you miss social cues. People speak to each other with words, but also with tone, inflection, and body language. If your disability has left you unable to see part of this communication, then you're going to be outcast by people who don't understand you.
You should seek professional help for what sounds like chronic depression, loneliness, and an inability to bridge the body language gap on your own. If you're still a minor, then reach out to counsellors at school (if they're any good; that's pretty hit and miss), through a youth organisation, or through an organisation that specialises in helping people with Autism.
Those things are NOT your fault.
One thing that is your fault, however, is that you have a self-defeating attitude. It comes through in your posts and even in your choice of user-name.
It may be that your parents failed you in their fundamental duties - not by having another child, however, but by ignoring your special needs. (There are some parents who, when confronted with the reality of a disabled child, simply ignore it; they do the least they can to accommodate the disability in their effort to pretend it isn't real. That level of parental irresponsibility has fucked over many, many, maaaany people - possibly including you.)
The reason why people now blame you, telling you that you're both entitled and self-defeating, is because your attitude invites that kind of commentary. We could be totally wrong about you...and in fact I suspect there is a lot more to your character than the little bits of it we see splattered on the forever-alone incel reddit where you post among bitter 40-something divorcees whose marital dissolution really WAS their fault either in part or, in rare instances, wholly.)
Has it never occurred to you that some of the advice you get comes from people who were once in situations such as yours? Other people have had shitty, self-absorbed, and inattentive parents too.
At bottom - at least in your case - this is not about fault. Disability is an innocent condition of being, and not a choice.
Choice comes in when you're old enough to decide how to handle the situation - old enough to seek help from qualified professionals and not from the "professional" victims that populate that sub.
Anger and hate are strong emotions and they can suck you dry to the point where you scarcely have the energy to interact with anyone. Instead of feeding those emotions, please consider getting actual help (in the real world) in learning control; in learning to forgive even if the person in question does not deserve forgiveness.
It is, to put it a certain way, a gift you give yourself.
Consider starting with your name: 'iamnothopeless'
