so passive voice is only a concern when it has to verbs right? for example, "I was still disappointed," isn't considered passive voice bc disappointed isn't a verb.

For your question, in this particular example “disappointed” is a past participle used as an adjective. So no, it’s not passive voice, but it is still telling, rather than showing.

I think there’s a bit of an issue with writing advice that doesn’t explain exactly what’s wrong with passive voice because it leads to people just thinking passive voice = bad and that’s just inaccurate. So let’s talk about that too.

Passive voice slows down the narrative because it turns the subject of an action into an object.

The cellardoor rattled with barely a sound, almost softly. Elisabeth spared it a glance, but nothing more. She let the thumping of her knife against the chopping board guide her into her trance. The chopped herbs were gathered with a swish of the blade and she was gone.

This is the opening of a tidbit I started on a prompt Legit gave me. It’s just a first draft, but it uses some passive voice, so I’m gonna use it as an imperfect example. The character, Elisabeth, is a witch and she’s preparing herbs. The piece starts in active voice, but as Elisabeth chops her herbs, it moves into passive voice. I chose to do this on purpose to accompany the feeling of Elisabeth falling into her trance. The chopping sound “guides” her into it and then as the trance starts, she is no longer a fully conscious and active subject and I switched to passive voice. 

Now, I haven’t decided yet if it works in this particular passage, but the principle is evident: sometimes you need your subject to become an object and you need your narrative to slow down to change the atmosphere. Passive voice is there to help you do this.

This is the same thing for all “don’t use X” writing advice. It’s not “never use X”, but a “be purposeful in how and when you use it and don’t abuse it.”