You rode your motorcycle for years without fear or anxiety. You respected the bike and the risks, of course, and you used proper safety gear. But you never felt nervous while riding.
You cannot avoid all car accidents. It's impossible. Human error just plays too large of a role.
You get in a motorcycle accident and you hit your head on the other vehicle's hood. You do have a helmet on, fortunately. You walk away from the wreck, though you feel a bit dizzy, and the doctor tells you that you have a concussion.