Embarrassed in the shower room

Are there any guys who have issues being naked in front of other men in the shower room? I am 32 now but have always had problems with my penis shrinking (very small) when I shower in front of other men. I am ok if I am the only person there but beware if another man walks in. I see others looking at me but it seems to get smaller as they see it .

JIMBO: When you are apprehensive your bodies natural reaction is to draw your penis(and testicles) into your body hence it getting smaller whe others are around. I was told this by a nurse and so assume it to be true and it also compares with personal experiences. So my advice is relax it's a confidence thing and at the end of the day we are given what we got and so need to just get on with it as your probably a normal guy.