MY mommy says that if I pray real hard to God, he'll answer all my prayers and give me anything I want?

So why haven't I gotten a 42 HDTV Flatscreen TV in my room yet? I've been praying and praying and praying all the night long and I still haven't got it! It's not fair! Why doesn't God care about me? Why don't I matter to him right now? Hmph! Why is my life so rotten....