Mentoring

I have been trying for a few years now to find an established photographer who will take me under their wing and show me the ropes. But I have never found anyone who will even send me an e-mail response, much less take the time to mentor me. Why are people so unwilling to help others learn their craft? Jealousy? Protecting their territory? Insecurity? Who knows. But I feel that if you are secure with yourself and your abilities, you will not mind helping someone else become better at their craft too.