You don't need to eat at those expensive restaurants if you can eat it in a normal restaurant, because if you are just earning minimum wage, then you don't need to eat at those restaurants. Don't be fancy, and you are right, don't buy those nonsense items that you don't need. It is really about self-control because, as others have stated, if you can't afford it, don't push yourself to afford it at that time; instead, work hard so that you can afford it in the future. Right now, because of the high prices, people are sure getting a budget on everything.
Sure, you do not need those things, however, people are living not only needing lives. We have desires, ambitions, self esteem and endeavour for realisation. We have to earn our place in society. And that is why we are doing a lot of things. Yes, we could not do it, but then our lives would look dull, savourless and boring. A person should strive for something, desire something. Only then does he or she feel alive.