Risk of injury is just a part of life. I mean, it can happen to anyone at any given time, doesn't have to be going down a slope.
A serious crash could dampen anyone's spirit of the sport, I think it's your body's natural reaction to let you know eh, you hurt me. It comes down to how badly do you want it? Do you want to grow old wishing you had done something? Or grow old saying that you tried?
Best you can do in my opinion is learn from your mistakes, assess the situation and perform it to the best of your abilities. Respect the mountain and the hazards it poses and don't get out of line.
Understanding your ability is another thing also, knowing what your capable of and developing ride confidence; As well as being knowledgeable of the conditions, and how they change your riding style accordingly.