@Pringletot
At 15, I was probably just like you. Middle to upper middle class. However, I think how my parents raised me has a lot to do with how I think now. My parents might have been more well off, but it's because they worked...and they worked hard...every single day. They worked hard to give me a home and food and shelter and books and toys and anything you can imagine. But see, they didn't just give me whatever I wanted without my having to earn it at some point or another. I did chores. I had to keep up my grades. If they asked me to do something, I did it. I might have been given opportunities that many don't get (like getting to go to university) but I don't take these things for granted, and I think that's the difference. It's okay to be fortunate and have money and be of a family with hardworking parents who have earned every penny they have. My parents weren't given anything. Everything they have they've built themselves, and I can only hope to be as successful as they are. But the point is that once you're able to afford luxuries and be successful (I find the word 'successful' problematic though... what does it really mean?) ...you should also be able to appreciate 'luxuries' or things that don't or shouldn't come so often. So that when they do come around, they mean something. Like a vacation, or a new car.
