While I did experience some sense of embarrassment during my earliest school physicals, because it was the first time I remember being naked in front of strangers, all of my other physicals when young were with our family doctor who I'd known forever, so I didn't have much embarrassment there, with the exception if a new office assistant might be there.
However, as I've written about in another post or two, I did gain an appreciation for embarrassment in situations where someone is stripped in front of others, by watching TV shows where this sort of thing was used in comedy.
There were lots of shows, including many for kids, where they'd have some skit or scene where a guy would have to undress in front of others, usually in a public place, or he would be stripped by others. I remember some game shows where people would undress for prizes, usually covered from the neck down by a screen or sheet. There was one where the host went into a laundromat, and offered a woman money to take off articles of clothing, eventually getting her down to just wearing a towel.
Even done in educational shows, where something would be demonstrated, like measurement, by having a guy undress. Often, this was at the direction of a female, or group of women.
It was usually comedy, and the embarrassment, and humiliation, was meant to be funny. There wasn't really a sexual component to these situations, although it often involved women being present when a guy was undressing or being undressed.
I remember that feeling of my stomach dropping whenever I'd see such a scene. It left me with a thrill, and I'd certainly think about these scenes over and over. I'd talk about it with my friends, sometimes we'd even play out similar scenes, pulling down each other's pants or shorts, laughing about it.
And, of course, there were situations where kids might try to embarrass someone they didn't like, by de-panting them. This never happened to me, but I witnessed it several times. Usually, it was an older sibling doing it. Where I grew up, this wasn't done too viciously, never involved an outright assault, so it didn't have that type of trauma around it. I could certainly see it going that way if taken not all that much further, though, and that would likely have left a very different impression on me.
So, this was very much part of what fed my interest in Medfet, exhibitionism, etc. A good example of images from social media influencing us from a young age.