God created us to worship Him, to love Him, to love people and use money, but what greed does is that it makes you love self, worship money and use people.
Greed is the illegitimate and unauthorized desire or pursuit in acquisition of material gain.
If you use illegal or immoral means to acquire things, then you're driven by greed.
If you complain more than you give thanks then you're driven by greed.
If you're more concerned about your cash than your character, then you're greedy.
If you treat people with money better than people without it, then you're greedy.
If you hurt others in order to get something for yourself then you're greedy.
If you crave and plot to possess what legitimately belongs to somebody else, you're hanging out with another relation of greed which is called covetousness.
You can be giving things and still be greedy. Generosity begins with giving thanks and not giving things.
Be contented, grateful and watchful of your desires. Your luxury is at God's discretion!