"It's such a funny image..."

In seventh grade, my four best friends and I were decorating my friend's Christmas tree. At one point we were all keeling on the couch, leaning against the back of it, looking at the tree, while my friend decorated it. 

Then she switched her glance from the tree to us, and laughed and said to me, "It's such a funny image to see everyone with normal butts, and then you with absolutely no butt!"

Everyone laughed, and I did too, but I felt mortified and horrible. I wasn't even aware at that point that I had no butt, or that having no butt was such a funny sight. 

After her comment, I ordered padded underwear off the internet. Now as an adult, I no longer wear the padded underwear, but I am still very much aware of my butt at all times.