i've done a lot to my neck, literally one point been thrown in the air, and fell 5 feet to land on th side of my neck.
as long as nothing hit the oesophagus (front chunky bit) or literally breaks your neck. you should be fine. if it hits your oesophagus, you will choke and find it hard to breathe, but you'll be fine, or it'll break and you'll suffocate to death.
if you break your neck, you either die as all nerves are broken to your entire body, or you're in a lot of pain, but can apparently still be a goal keeper.
there are worse places, a hit to the sternum can stop your heart. any hit to the head can kill you.
and if you get kicked in the balls, you wish one of those other things had happened instead.
relax, your not dead.
your just scared