i think you just have a p-spot problem.. i dont get this issue ever
It's not that I needed to wee but couldn't.
It was that I was trying to have a wee when I didn't need to, just to make sure I was empty.
And then if you're at a urinal clearly not weeing while others are around you look silly.
This never happens other than in this circumstance, where I know I'll be going a while without having a chance to wee.