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it's hard. if you've known them since they were a minor, it changes how you think of them, and that's not your fault. but, i also get them wanting to be treated like an adult now that they legally are one. in the end, you have the right to curate who can see your stuff, and if you're not comfortable with them seeing it, you have the right to deny them that
its not that im uncomfortable with it, i just dont want to cause any harm
that's also fair! i would probably do the same because they are still young, even if they're legally an adult now, and you know that firsthand