Why are some people born with it all and others aren't?

You know that girl from school whose parents are filthy rich and she lives in a mansion and is beautiful naturally, smart, athletic, popular, happy, and kind? Why are some people blessed that way and others aren't? I was born to a poor family and I'm not very pretty and I'm not popular, smart, athletic, etc. Although I am happy for what I have and I love and appreciate my family, I don't understand why God does this. Why can't everyone be blessed like that with an amazing life?