childhood fear

I have a childhood fear...

When I was young I used to hear from my old primary teacher saying that if you kept on holding your pee, those pee will somehow changed into stones inside your urine bladder and eventually cant shoot anymore...

Then later you must go for operation then you have to cut something

Oh My GAWD!!!

I don't even wanna know what they cut =.="

Please tell me that is not true!

Of course, there are other fears as well but I think I'll just tell one here.