Like cells in a body with their different functions, you are in a world where each human thinks and behaves a bit differently.  If you are constantly comparing yourself to others and you find something wrong with all not being the same, then you will suffer.  At the human level, all are not the same.  Were they so, you would stagnate.  Know that at the level of spirit, all are one.  All arise from Love.  It is this disparity that causes the growth, so appreciate the differences.  See them as what they are:  fascinating.