This is not normal. Lenses are often a bit sharper in the center than at the edges, especially wide open or at the ends of the zoom range, but not to the extreme shown here.

The most likely cause is a decentered lens element—one of the internal elements is misaligned. That can produce strong edge blur and uneven sharpness that isn’t explained by focus error, shallow depth of field, or normal hand shake.

So while some softness can come from camera movement, the severe edge blur points to a lens fault rather than user error. The best next step is to send the lens to Canon or an authorized service center for inspection/repair.

If you want to confirm it before sending it in, try a simple flat test target (for example, a printed pattern or high-contrast marks on paper) and compare sharpness across the frame. If one area or the edges are dramatically worse than the center under controlled conditions, that supports decentering.