money not enough

Had a shock when I received my uob debit card bill statement. $603.92. I knew I spent a lot, but for that amount to be a whopping $600 plus, that was not what I thought it was. So I did really spent that huge an amount of money. No wonder my data entry pay was not enough. No wonder I needed to top up the account constantly in order to use that card. No wonder there are so many plastic bags of purchases made piling on my table. No wonder I was seriously broke throughout the whole month. No wonder, no wonder, no wonder. Sigh. When did I become such a spendthrift?