In short, yes they are natural.
To me, “Every time we step inside” makes me think the restrooms are very smelly and dirty – you can see or smell as soon as you walk in, while “Every time we use them” might just mean that parts of them are dirty. It is a pretty small difference though.
Also, saying “we all feel” makes me thing that you go to the restrooms in a group, which may or may not be true. You can remove “all” to make a more general statement.
Finally, I personally would use the term “toilets” instead of “restrooms” but I believe “restroom” is a widely understood term in English speaking countries.
Student or Learner