There are lots of theories why we are here.
Some believe in a loving (or wrathful) God.
Some believe in self-actualization.
Some believe in love.
Some believe in evolution and the supremacy of predators.
There is no proof any one view is ultimately right, unfortunately.
Whatever view you subscribe to, or eventually settle on,
it all boils down to this residue that applies to us all:
Deliberately, and the best that you possibly can.