I use bathroom stalls at bars so no one will see my big fat cock. I am shy and thay may tell everyone about me.
Hey man, why do you feel that way? We all have a penis, some big, some small. It is what it is. Small, average, or big. There's nothing anyone did to deserve a small penis or earn a big penis. In most cases, if you're fat or dress poorly, that's your own fault. But a big penis? Most guys will be jealous, enjoy it.
Nothing wrong with being modest or shy about it. Sure everyone has a dick and you have a bigger one that most. However that doesn't mean you feel comfortable showing it and then worrying that someone might embarrass you. You simply want to reserve showing it to the person or people you are comfortable with. Nothing wrong with that at all.
I wish I had a big one to show off. It's best having a big one than a small one. I would trade dicks with you in an instant. Be proud of what you have and allow it to be seen. I wish people talked about me for having a big one. If you've got it, flaunt it.
I use the urinal 96% of the time. If there is a line I'll use a stall assuming there is no line for it. (door open no point in closing it.)