I remember using a wheelchair back before I had a diagnosis and got treatment, on days when my pain was really bad and I really needed to pick something up but didn't feel up to using my cane.
I also remember feeling like a fraud because I could walk theoretically. At least, my legs worked. So why was I being so damned lazy? Until my friend reminded me that it was 1am and those wheelchairs were just gonna sit there unused; I was depriving nobody.
I uses it then, and once or twice since. But that feeling that I was faking or a fraud never really went away.