There is no "Fair" when you become a parent.
Parents who hate parenting misses their old selfish lives. Being a (good) parent means you no longer can be selfish and your life is no longer about you.
That might seem grim, but what you get in return is a little human that looks up at you. That holds your hands because you are their world to them.
Let go of your selfish lives and learn to enjoy your new selfless life.