Why it does that ?And how to fix it?

When I go out my home my penis automatically shrinks up I don’t really know the word for it but it’s annoying and same when I go to train !Can someone help me with this I know it’s kinda normal but it’s very annoying because when it shrinks I only think my PE will not have effect on my Penis .

And also when is the best time to do PE? I only do it once a day for 20-30 minutes and I see other people talking about how they do it like 2-3 times a day for 10-15 min !So I want to change my training to 2 times a day 20 min each PE Session .And the thing is when to do it ? In the morning and before bed or what ?

Thanks for the answers god bless you :) !

Perhaps, you have subconscious anxiety when leaving the house. The same thing happens when I first get to the gym because I am not comfortable getting undressed in front of strangers (body dismorphia). After I work out, it doesn’t seem to bother me and my shrinkage problem goes away.

I think it’s because I’m kinda awkward in social situations .I’m totally fine with my body tho :D