I went through a phase in my late teens/early 20s where I had major bladder shyness. There were a few times in especially high pressure situations (e.g. right after a movie or during a break in a football game) where I just stood there for 30 seconds with no results and was like "welp I guess I'm just gonna have to hold it until I get home." I honestly don't think I had any major psychological shift, since I was and still am majorly anxious, but thankfully it waned over time and I can now piss in peace.