Why are underwater rocks so sharp?

deb

New member
About a week ago me and the family went swimming in the lagoon or lake as you guys may call it
I swam (more like stood) at the very end where they put those safety cord things whatever the name is, and I decided to go a bit over that line where my foot hit these rocks at the bottom
Now they didn't feel sharp at all, just maybe slimy and not smooth but not sharp either

I left with three scratched small scars on that foot, now it iches like crazy!
But it felt like nothin! What's up with underwater stuff?
 
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