✔ 最佳答案
Your question: "Is it true that we all have a purpose in life?"
If you don't mind answering, what is the purpose of asking the question at issue?
pur·pose
noun
The reason for which something is done or created or for which something exists.
Not inherent are various learned schemas, of which there are too many to count.
For example, the
The answer is: Yes.
The purpose is inherently to maintain a genome and make new and diverse phenotypes from it, one per unique human being.
Not inherently there a probably infinite variety in contrived or learned purposes varying from person to person, although not all persons subscribe to having such a purpose in mind.