Is it normal to pee in the shower

It's called saving water.

out of 100 people 50 pee in the shower and the other 50 lie

It's normal, I poo in the shower as well.

Yeah, everyone does it.
Personally, being a Dragon Ball Z fan, I try to do an energy attack clash of my dick's beam vs the shower head's beam. I usually lose though.

I just whip my butt over the edge of the poop deck and let fly all over the cabin boy, I call it a Cleveland steamship.

Normal because your body is going in water or you don't pee before you go to bed

Normal. I do that as well since it's all going to get washed down the drain anyway.