I take public transportation every day and it always brings an interesting dilemma as I use a priority seat if no regular seat is available. (Of course, if an older, disabled or pregnant woman boards the train, I offer my seat. I am not a jerk about it).
It's interesting to observe others' look - from disdain to indifference. I am not disabled and not visibly impaired. If needed, I can stand, but it helps me a lot, especially at the end of the day to be able to sit for the 1/2 hour train ride.
... and I'm done feeling guilty about it. Just a new MS experience.