Is there something wrong with me?

I was stretching my back yesterday with my hands placed upon my lower back and noticed a bump on my left side similar in hardness to a rib, but protuberant to the 12th rib (lowest one). It felt connected to the under end of my 12th rib but a tad thicker and bit more a of a bulge closer to my spine. I was freaking out thinking this was a mass of some sort on my kidneys or ribs, my fiancee felt nothing unusual and said I was imagining thing, and that what he felt was my rib. I calmed down and felt the right side identical to where I placed my hand on the left side and, even tho not AS bulgy (only slightly less) there was a bulge in the exact same spot, on the right side. I am wondering if this is normal, if I should be worried, and if you on yourself can feel something similar on your back, 12th rib.