I have been on disability for 8 years. I've gone to school part-time during this time, and had a small part-time job for a couple years in there. Now, I don't work. The only 'work' I do is a work-exchange at a yoga studio. In exchange for four hours of cleaning a week, I get all the yoga I want. I work with no one after hours, which is how I need it.
I like Omnicell's post. We have capacities, but we also need something different from the inhumane 40-hour work week that does not consider people's personal rhythms - it's robot-mode. I contend with feeling ashamed for not working, but really it is not possible. I, too, feel retired, and this is difficult. I'm 36 years old, and wish sometimes that I had the impetus to 'do something', like write a book, or start a project or something. But, I have to keep reminding myself (I used to use busyness as a way to avoid my feelings) that I am on disability for a reason, my mental health is poor, and I need to follow my natural rhythms to get well again.
Like Omnicell wrote, we can be active at some things, at our own pace and time.