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You can consider yourself anything you like. Time is relative. I’m older than you and would say 24 is young. A nineteen year old might look at you as an antique. The trick is to know your audience. Don’t openly call yourself young if you’re among the elders in the room.
For my answer I’m going to assume - because it wasn’t all that clear to me - that you are also female and you’ll be teaching somewhere in the United States of America. If I’m mistaken, stop reading here.
Kids don’t care. If you tell them this person loves that person and that’s why they’re together, that generally settles that. The problem here is their parents or other influential grownups in their lives … if they’re a-holes or just always have something negative to say about LGBT+, or worse. If news filters through to them and they’re fond of the MAGA hat, I would not be surprised if at the very least you’d be heavily discussed in a text thread of like minded parents.
I would like to say “eff it, it’s 2025, you do you! Shout it from the rooftops. You have nothing to fear in reprisals.” But I’m thinking “sh!t, it’s 2025 in America, there is a chance that you will have to deal with a ton of it if you’re unlucky.” So the question becomes one of your inner fortitude: do you think you can do this job while facing sh!t every day? This ranges from hushed chatter to outright questioning and condemning you for your identity, from kids to parents and possibly to the faculty? Do you want to risk putting quite a heavy load on your shoulders on top of what teachers carry in general? If you say yes, or you can find other work when it gets too much, go for it. If not, I’d be cautious to make it about you. You can talk in general about how relationships are described in Spanish without casually mentioning where you stand.
Personally, I want all of us to live in a world where any of these considerations seem laughable. My gut feeling tells me that we have been closer to that ideal in the past decade than we are today.