I would not say it is hard to be human and it isn't easy as well. Being human is being the most intelligent creature on earth. It is like the entire world has been handed over to us to do as we please in our equal rights. Then there's a whole lot of us trying to take control of the mantle. It is survival of the fittest.
We are faced with life's tragedy like failures, disappointment,loss of loved ones, aging, betrayal etc but our natural spirit to overcome and move on makes it easier and there's a balance of love, happiness, laughter, fulfilment and achievements.
In the end we wither away like the flowers and the only thing left of us is our imprints and memories. It definitely takes a lot to be human. I wouldn't call those who think it is hard lazy and cowards. It was nobody's choice to come to earth. Some people wish they were the galaxies that light up the world.