Please explain to me like I'm retarded (because I probably am) why I'm not getting a blurry background when I set the f-stop low.

All the tutorials say lower number = blurry background, higher number = clear background. But here I took two shots, one at 3.2 and the other at 8.0 and they look virtually identical. I photoshopped the effect I want but I don't know how to get it. These are the lowest and highest my camera will allow me to do when I set it to A priority mode (Nikon Coolpix).