Since all three comments so far seem to have had the same basic objection, I’m going to reply to the parent.
It seems like the claim in your first paragraph is implicitly disjunctive: IF your beliefs are “about the world” (i.e. you’re modeling yourself as an agent with a truth-seeking epistemology), THEN “convincing yourself” isn’t a thing. So IF you’re “convincing yourself”, THEN the relevant “beliefs” aren’t a sincere attempt to represent the world.
Since all three comments so far seem to have had the same basic objection, I’m going to reply to the parent.
It seems like the claim in your first paragraph is implicitly disjunctive: IF your beliefs are “about the world” (i.e. you’re modeling yourself as an agent with a truth-seeking epistemology), THEN “convincing yourself” isn’t a thing. So IF you’re “convincing yourself”, THEN the relevant “beliefs” aren’t a sincere attempt to represent the world.