We mold our children

When our children are disrespectful, unappreciative, disruptive, mean.... Who is to take the blame? I have no one to blame but myself. I have made them the way they are, I have molded them. How do you change such a vicious cycle, that you have created? I feel like I have failed my children by giving in so much, spoiling, and not showing them that there is so much more to life than material things. I really need some guidance here. I can only pray that I can change my ways, lead by example, and shower them with love more than material things to express how much I love them. Is there an AA for this? I want my children to be happy, I want them to know how much they are loved, I need for them to know that I am here for them... And I am doing it all wrong! They expect everything. They cry and throw fits when they do not get what they want, they pout over not getting a toy every day. What have I done?!