Would you mind clarifying in which of these 3 dictionary definitions of the word objective my existence (in the sense of the "particles" of my body) is not objective? Or maybe these definitions are not exhaustive? Perhapse the term objective has become overloaded.

objective

adjective

Not influenced by personal feelings or opinions when considering and representing facts; impartial. “Historians try to be objective and impartial.” Synonyms: impartial, unbiased, neutral, dispassionate, detached. Antonyms: biased, partial, prejudiced.

Existing independently of the mind; actual. “A matter of objective fact.” Synonyms: factual, real, empirical, verifiable. Antonym: subjective.

Grammar. Relating to the case of nouns and pronouns used as the object of a transitive verb or a preposition.