Sea urchins @ adriatic beaches

Anyone ever actually stood on a sea urchin?

If so how sore was it?

I only ask because I gave myself a bit of a phobia last year about swimming with any rocks underneath me in case there were sea urchins and it became a bit of a big thing.

I don’t want it to be a thing this year as I really want to enjoy and love to swim.

I do wear water shoes in the water, so I’m covered for that.

Any advice/experience?