The student pilot reported that, during the landing roll of a solo flight, the airplane landed to the left of the runway centerline. He added that he applied right rudder, but overcorrected and the airplane veered to the right. The student pilot reported that he "panicked" and his leg "got stuck on the right rudder". The airplane veered off the runway to the right and impacted a ditch.
The airplane sustained substantial damage to the firewall.
The student pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.