You might spend more on "wants" than you think. A threadbare minimum of warm clothing is a need. Anything beyond that, such as shopping for clothes at the mall rather than at a discount outlet, qualifies as a want. Yes, the rules are tricky, but if you think about it, they make sense.
But try this anyway. Creating a budget and then following it can help you spot areas where you're spending more than you realize. Here you will find tips on how to create a budget and track expenses along with other money management techniques.