Life's purpose- your purpose- is to glorify God.
From the large galaxies in deep space, to the small bacteria in shallow waters; Things animate and inanimate, alive or dead, large or small, all things share the same ultimate purpose- to point to the glory and majesty of God.
You are unique.
You do not just display the glory of God's power to create- but you display aspects of God's character, due to being made in His image. This puts you far beyond the rest of creation in terms of your connection to God, and how you bring glory to Him.
All men are called to worship God by having a relationship of Love, Obedience, and Praise with God- living out the innate Godly aspects implanted into us by the Lord, and using them to Love Him and others.
You and I exist to bring glory to God.