Argon, I do empathize! Back in the 80"s when team building was all the rage, it was awful! Now I go to a class and if they want to divide us into teams I screeech internally. It takes so much energy to work inside a group that I can't deal with the subject matter. And yes, being alone is good.
From my perspective, finding a good career match means marrying subject matter and interaction demands so that you can stay inside your comfort zone and still be challenged and interested in what you're doing. Then you can be successful and valued. Temple Grandin wrote a book on careers for Aspies. I haven't read it, but I have enjoyed her other work enormously. Like Nominalist, she's in a university setting, but works a lot with animals.
You sound like a Brit (single mum
) so I don't know what your resources are. In the US we have Vocational Rehabilitation where you can get tested and they can pay for training. Also, you might do really well with online education. I'm studying holistic nutrition on line, and am enjoying it, even at my advanced (65) age. (there, does that make it more on topic?)
Hope this is helpful. Sometimes people get offended with advice and book recommendations, but it's my way of saying I would like to be supportive.