Let's get real: You are not a disabled person. You
just don't look like the average person which makes people think you are disabled. But people think wrong all the time; and this should never be an issue.
A disabled person is that, by definition. He can't do the task because of his disability. So he can't get things done unlike you. If you are in the digital space, can move reasonably well, can type and use the mouse, and your brain functions are not altered; I don't see why you won't be able to compete with the average person.
In fact, I'd say it is the opposite. The average person is disabled by everyday life distractions. Like dating for example. Or traveling around. I can see someone in a chair performing better than them. You can get a lot done via internet. Like emails, paying invoices, setting up stuff, etc... You don't need to move much if you are building a SaaS.
The disabled guy will be sticked to the chair with no access to the rest of the world "entertainment". Their best entertainment is to carry on work.
PS: Please bear in mind that I'm generalizing this and not targeting you. I don't know your lifestyle neither it is the issue of this comment.