If you can't remember what you bought, there's a good chance that you didn't need it. Think about all the ones you do remember. Here's a quick test for you. Look at it this way. Do your own math to see how much is flying out your window every month in interest.
Some people look at money as 'fun tickets'.
They think that you buy stuff and happiness follows. Those are usually the people with long credit card bills. Others view money as a measure of their success. They need to earn more than their neighbor to feel 'fulfilled'. Since they're always on a quest for 'more' they can't be happy with what they have.