A better mentality is to always think: "Do I really need this product/service, or can I make do with things on hand that I can rebuild/repair/reuse in some manner, and am I sure this purchase isn't just for the dopamine reward?"
Sometimes the answer will be yes, and a simple purchase can have a lot of positive knock on effects - good tools, for example, allow you to repair things that would otherwise cost much more to replace, and last much longer than cheap tools.
The claim that economic growth relies on consumer confidence (high levels of consumption) is also pretty suspect and relies a lot on how you define 'growth' - what's wrong with a steady-state economy with a stable human population and fixed levels of demand for goods and services, anyway?