Shared Notes! Eek - no idea how it happened!

I shared a " Note " without knowing and 100% it was not meant to be for my Mum & Dad (even though I am well and truly and adult).

I just went into my Notes on Macbook Pro and saw "shared notes" I have shared 3 notes, absolutely unbeknown to me. I have notes synced with my Iphone and Mac, but definitely have never, intentionally shared notes.

How does this happen and how do I disable sharing automatically? Would love some instructions on how to stop this happening please. Thank goodness I didn't say anything saucy!

Also, I have turned off share for the "Notes" I did share, but is there a way to ensure that the recipients can't read it?