You will see other people nude but can go into the restroom to change and maintain your privacy of you like.
I was body shy at first. In fact, I was so stunned I was momentarily paralyzed. Then I quickly got over it. It's amazing how quickly you just don't care.
You get a uniform when you check in shorts and t shirt which you put on in dressing room. If you use the facilities in your gender specific area clothes are not optional (hot /warm/cool tubs and the sauna/ steam room). In mixed gender areas. Everyone is in the uniform. Shorts/tshirt. If you are body shy, don't be there are all shapes and sizes there.
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