Carpet burn............from the gym!

You know this really bugs me. I did shoulders today and abs, 1/2 hour of each as can't get to the gym tomorrow as its Baileys 1st birthday party. So anyway, I use the thick padded mat with my towel on top I may add and yet I still get what I call carpet burn. Now I am by no means a fat person, I wear a size 8 but having said that I do carry about 24% body fat which is really high and I can't seem to get rid of it, but it is all on my lower body hence why I get carpet type burn doing crunches. My back is really defined and skinny in fact the area where I get carpet burn the bone just sticks out, my spine sticks out too which I can't help but why oh why does my lower body look like its never seen any weights of anykind and yet I work it heavy. Maybe I am doing something wrong, maybe I need to diet like a competitor for the rest of my life???? who knows, but it gives me the SH***! So now I am walking around with what looks like carpet burn on my back!

Thanks Jeh for your comment about the noodles, I will have a look around!