@arrivedbysaucer have you ever been assessed for Autism? A lot of the things you are describing are reminiscent of my own experience, and a lot of women with ASD are unaware that they have the condition.
I have both autism and ADHD and I struggle immensely with executive functioning, with social anxiety and overwhelm, but I also have a career in crisis communications which I am proud of, during the days where I don't want to run away from the universe. Those days I also have, and sometimes 'succes' stories don't quite acknowledge that these are lifetime disabilities. I can wake up on Tuesday full of vigor and write 2000 words in a few hours and it'll be amazing, and on Wednesday I'll be at home with my internet turned off because I can't deal with the idea of receiving feedback on my proposal, and the sound of my doorbell will startle the shit out of me. Sometimes I don't shower for an entire week, occasionally I have a meeting in London and absentmindedly travel to Bristol. I have a disability, it's not all overcoming obstacles and 'ADHD is a gift' or whatever feel-good article the BBC has put out this month.
Your post made me feel immensely sad. It is already bad enough to feel as though you have been playing your life on hard-mode the entire time, but you are sounding as though you have absolutely lost all confidence and self-worth along the way. This is something that needs exploring and healing before anything else really, because you will self-sabotage whatever it is you try to do at the moment. I did this too.
To those suggesting that the OP should choose something simple and repetitive that needs no skills, I don't think that's right. OP doesn't have these skills at the moment, but they are things that can be developed over time, using strategies tailored for her.
OP, please don't sell yourself short. There are things you can do, things you cannot do, and things you simply cannot do yet.
I know that sounds cheesy, but the biggest hurdle for me has always been the complete destruction of my own self-worth aided by that constant 'why can't you just...' commentary that's been following me since I was a bloody toddler. By the time you are an adult, you think that you are defective and stupid and have nothing to contribute to society, but that is not true. Please believe me even a little bit when I say that it is not true.
If you would like to talk you can always DM me, but I hope that you will be able feel a little better soon. You're raising your son, learning about how best to help him, worrying about your contribution and being considerate of other people's feelings. You sound like you have a lot to give OP. I've got my fingers crossed for you.