Genuine question

Why does heaven and hell exist if life isn't fair? A child who has been abused or raised with bad parents is more likely to sin compared to a kid who was well raised. Certain people are born with privileges other never get. If we aren't born equal then what is the point of heaven and hell? I myself have suffered a lot more than others whom I live with or am friends with just because of the way I was born and I have zero control over it and yet i am expected love God like others?What does the bible say regarding this?