What is the main reason of extremely loud hisssshhh sound of my pee?

In girls, when we pee, there's naturally a bit of a loud 'hiss hiss' sound. But in my case, the hissing sound is quite louder than usual when I urinate. What's the reason for this? Often my 9-year-old nephew asks me, 'Aunty, why does it make such a loud sound when you pee?' 🤣