Felt like i needed to share experience today going to YMCA by my place.
Usually I go there later in the evening so as to not have a lot of people there to worry about but today went there right around noon and was fairly busy. A few people in change room. I still went into women's change room just to finally face my fears of going in there alone. Was able to go in, get changed and leave without anyone batting an eye.
After finishing my workout and going back into change I had one person (a lifeguard) kind of staring at me but never said anything and no other issues were had.
All in all was a good day for me and now I know i should have no problems in the change rooms!