Am I Desiring Worldly Riches or God's Will?

I always feel guilty when I buy things for myself, because I think of the store as God's business, and he allows me to work here and manage his accounts. I know if I abuse it, I will lose it. When deciding whether or not to make a big purchase, like a house, I have to do a lot of soul searching to be sure I'm making the decision for the right reasons, and not out of greed. I know I am not the only one to struggle with these questions, because the Bible has a lot of mention of this in the Bible, and there are lots of websites discussing this topic. Even now, I wonder if I am talking myself into it, or if I am whole heartedly listening to the holy spirit. Let me know your views on this topic, and thanks for watching.