Being on the spectrum is making me undateable

Yes, you keep telling us this but unfortunately there isn't much we can do about it if the replies you've had so far haven't made you feel any better about yourself. Maybe you could think about what you could change to increase your self esteem?

I can't change anything, there's no cure for being on the spectrum

Being autistic doesn't mean you can't change your thinking. 

Probably - that's the result of this long dry spell, seeing no signs of interest from women and having grown up struggling to fit in and being one of the easiest kids to make fun of

Your negativity is possibly a major problem. You may be putting women off by giving off a very negative impression. People in general do not like interacting with someone who has a depressive or alienating effect on them.

I feel as if no matter what I do or how hard I try, I'll never be more than a walking can of woman repellent

I feel as if no matter what I do or how hard I try, I'll never be more than a walking can of woman repellent