I would shorten that statement and add a couple of sentences:
Humanity is purposeless. Everything that you do in this life has no objective value. Meaning is arrived at through your subjective valuation based on your life experiences. Life is what you make it.
Humanity is purposeless. Everything that you do in this life has no objective value. Meaning is arrived at through your subjective valuation based on your life experiences. Life is what you make it.