Subjectivity often prevents people from recognizing or accepting objectivity, especially objective Truth.
Subjectivity exists because of chemical reactions in human brains, and to some extent, in the brains of higher order mammals. There's no mystery to it.
There is objective Truth.
Nothing can exist without also having attributes.
Objectively, the meaning or purpose of life is to reproduce in order to perpetuate the species. That is the purpose and function of every life-form that has ever existed on Planet Earth. As a point of fact, every life-form that ever existed on Planet Earth evolved to primarily reproduce to perpetuate the species, and secondarily to take advantage of its environment in order to further its primary function.
The fact that humans -- endowed with higher mental faculties than other mammals -- can voluntarily choose not to reproduce, does not change their primary function on Earth. Note that the choice not to reproduce is based on subjective reasoning (wouldn't be a good parent, don't like children, too selfish to provide for children and the like).
Subjectively, the meaning of life is achieve personal goals, sometimes for the benefit of the individual, sometimes for the benefit of the family, and sometimes for the benefit of the community or Society as a whole. There are, of course, those people who choose not to have any goals, or who choose goals which cause harm to others, or who choose to believe life has no meaning.
Regardless, everything is governed or influenced by chemical processes.
