Growing sometimes means apologizing for things you honestly didn’t think were wrong at the time.

Standards move, and they move backwards over your own record. You can learn something at eighteen that makes a thing you did at fourteen look plainly unkind, even though you genuinely did not see it that way at the time. Not knowing is a decent explanation. It is not a reason to leave it unsaid.

If somebody comes to mind, apologise for the specific thing and stop talking. No history of how young you were, no account of what else was going on. The whole value is in not defending yourself, and that part takes about two sentences.