One of the first things your parents will teach you (hopefully) is to use the words please and thank you. We'll call them "Magic Words" because they truly do magical things when you use them. People respond in a more positive manner when treated with respect and appreciation. The sooner you learn this, the easier your life will become. There will be very little denied to you if the request is preceded with a sincere please. Just don't whine. Trust me on this one.
God will bless you with many wonderful people in your life. He will work through them to bestow grace in more ways than you could ever imagine. And the best way to show your gratitude will be to graciously accept the kindness with humility. Just say thank you and continue to strive to be worthy of the gift.