I always need more so I am never pleased.
That sounds strange. Need more of what?
More of the things I already have, materialistic satisfaction
That mentality is a bit frowned upon in society but it's not like it's illegal. You should use that greed to strive for better by turning a negative into a positive. In other words, pushing yourself to make more money to buy the things you want.
The value of the things I want are more than what I make and I hate that I can't have them.
Well then maybe you should work more or find another job in which you can earn more money. It would be good motivation for you to do better in life.