Sometimes when I use public restrooms I can't pee. If its just me in the restroom I can use the the stalls or urinals no problem. And usely if there's alot of people I can use the stall, but not the urinal( by use I mean actually peeing). But if there's only like one or two people in there with me I usely can't go at all, stall or urinal. So I don't know what's wrong with me, I wish I can just use the urinal no matter how many people are there, but every time I try(in less I'm alone) I can't. I mean I don't care if they see my penis or any thing. Any advice?