Men who feel uncomfortable with nudity and seeing other men's junk in locker rooms, Why?

i dont get uncomfortable with nude men around because i dont look at their dick or nose or ears. I dont mind men looking at my dick but I just dont wanna have a conversation or uninvited touch..etc

but im lucky to be around normal men that knows and respects boundaries
 
I used to think that i was small, so was afraid of being judged and didn't like eyes on me. So I didn't like how other guys paraded around with no shame. I now realise that i had nothing to worry about as my 5.5" flaccid is quite above average. I was an idiot.