I study the Vedas (book of Knowledge primarily from the east), and they say that lives of animals primarily consist of eating, sleeping, mating and defending. The scriptures tell us that the human consciousness and our ability to use our intellectual ability for a higher purpose is what makes us a higher form of life than animals.
The purpose of human life is to develop Krishna Consciousness as described in the Bhagavad-Gita (the Song of the Lord). I would recommend that you read the edition written by His Divine Grace A.C. Bhaktivedanta Swami Srila Prabhupada.
There are so many wonderful topics that are eloquently covered in the holy text that I am sure you will get many answers to your questions. The five major topics of the Gita are 1.The individual soul, 2.Time, 3. Material Nature 4. Karma and 5. The Super soul.
Awakening our dormant love for God and developing our higher consciousness is what life is about.
I hope this helps.