Life is never easy either it turns more complex till the time you find it complex.
Emotions like jealous,hate,love,revenge etc makes a life more complex substance and hard to live as every person undergoes betrayal,love,heart break and emotional trauma which turns a person more stronger creature.
Other reason for complexity of life is norms of society which pollutes the fresh air of thoughts to a dirty one rather one should come out with just themselves actually love themselves for what they are and that is the time everything will look wonderful in world.