I can feel my jaw bone on my left side, but not on my right?!

Why is this? When I feel around on my jaw on the left side, I can feel the bone perfectly, but when I try to feel it on the right, I can barely feel it. I was just wondering if this is normal for some people? The right side looks just like the left side, I just can't feel the bone. Why?! Should I be worried? I'm only 15, by the way. Maybe one side of my face is chubbier than the other?