I really don't think that they meant anything bad by what they said. They do not know how much you have accomplished in your life. I think that they meant well, not to belittle you. So please don't feel badly about
this. They probably mean that if they were in your situation, they probably wouldn't be able to do nearly as much as you have done.
I am not in a wheel chair, but I couldn't manage my own business when fibromyalgia kicked in. I haven't gone to school like you have. It makes me feel a little sorry for myself. I should have accomplished much more than I have. But I try not to dwell on that. I take life one day at a time. And work on the different things that I have to confront daily. Will I get out of bed tomorrow? I don't know. But I will cross that road when I get to it.
I honestly don't think you are playing the martyr at all.
Best wishes for you to have a wonderful day.
Hugs, Karen