So I'd like to address your points if I might:
"I look at all the threads in this forum, and I see people saying the same things over and over again. "How can I be attractive to someone I like?" "Why do I keep getting rejected?" "How do I get them to say yes?" Has it occurred to anyone that we're just not good enough? That we're single for a reason, and that reason is never going to go away?"
These seem to be people reaching out for help or just too lazy to change and want a forum to complain. Many people with all sort of disabilities find meaningful life long relationships or at least maintain the status quo (40 - 60% of marriages end in divorce in America) This is a place to get perspective from others who share our issues, if there were a gloating forum I'm sure it too would be popular.
"We have Aspergers. Aspergers is a disability. We're cold, we can't hold a normal conversation, can't make eye contact, and have meltdowns every time something doesn't go our way. We go from being manically happy to super depressed without any warning. We don't like being touched and can be so robotically analytical that we can destroy people's feelings without even trying. Sure, maybe we can get to a point where we can take care of ourselves, but what makes us think that we're in any condition to bring someone else into our lives? Has anyone thought about how horrible our partner's life would be if they had to be subjected to us every day for the rest of their lives? You might be happy, but they would be miserable."
The use of generalizations to make your point doesn't make it valid, there are people ALL over the spectrum. The point of finding a partner is to find someone to accept you for YOU. If you continue to go after the wrong people or none at all, your results will continue to be the same.
"There's plenty of fish in the ocean, but we're the three eyed trout that's oozing snot from between its scales and will probably give you cancer if you ate it. Anyone with any sort of standards is going to throw us back, and even if they don't we're going to be the worst decision they have ever made, and they'll spend the rest of their lives regretting it."
If your partners feel that way about you then you need to look harder and in different places. If what your doing isn't working then it's time to change it up. I have partners that still keep in contact with me, just because I wasn't their happily ever after doesn't mean we didn't share a worthwhile connection.
"And there's nothing we can do about it. We are just not good enough."
This final comment is just nonsense, we are intelligent people. If the effort is put forth we can learn and accomplish great things. I've learned how to be a better partner, person, and man, because it was important to me. There is SO much information, I've managed through trial and error to grow and become better. I still mask but now I also know when I need a break and can better explain it. I truly wish you the best because no one deserves to feel isolated and alone unless that's their end goal.