You live in a different world. You were born into a different time, culture, geography, and family. Even if you are a twin, you have a unique mind. As society becomes more homogeneous, we risk viewing differences as fairness or unfairness, haves and have-nots, you versus them. But life is not about comparing yourself to others; it is about doing good with what you have.
You waste effort when you compare yourself to others because you have different opportunities and challenges that are largely outside of your control. In fact, lack of control and the extremity of differences are the two biggest similarities between people. Focus not on others, but on who and where you are, in the here and now.