It's all a temporary illusion. People who seem to have it great now may not always have it so.
In their next life they might go through what you're going through now, and by then you might be way better off than them, eg you might have escaped the cycle of rebirth.
So you might in fact be ahead of the game.....
Also many people living a perfect life now are going to lose it all over time since there as so many different human tradegies that can and do strike at any time, so the more people have, the more they may also have to lose, although I'm not saying that applies in every case.
Alternatively, people having a better time now might have been through what you are going through now in their previous birth, and in your next birth you might have it much better....
But ultimately I truly believe that things balance out, but perhaps over a longer time period than our limited minds can understand.....
But of course I get that, for now, it's no fun at all.....