Does anybody know how to deal with this?

i guess think of why you want to be trans
i thought i was trans for years simply because i wanted to be friends with boys like boys r friends with boys
i realised that i still felt like a girl, i just liked being friends with guys

Interesting.
I just figured out what sets my experience and the guy's and yours apart: it was driven by extrinsic factors for you that made you think you were trans (if I understood you correctly, please forgive me if I didn't), but intrinsically for me. I'm actually reassured bc I thought about it. I think people think they're trans falsely bc they associate certain things with being trans while trans people actually just have an identity.
Sorry if my writing is cheesy, just got out of bed, still dizzy. But interesting insight in your life, thank you!

that makes a lot of sense
lol i just went to a jazz restaurant with two guys (and their parents lol im a teen) and we were joking around

I guess the fact that realizing I'm not trans would be the worst thing imaginable to me is an indicator for actually being trans, but what if it's not? I hate this situation.

Some advice from OneTopic, if you don’t know if you’re faking it, then you aren’t. Fakers know that they’re faking it

Good point (basically my catch phrase now, forgive me). I knew this advice (all hail OneTopic), but I forgot it. Also, I wasn't afraid of knowingly faking, but of deceiving myself.
But I'm really reassured now, since I've considered the facts, and yes, I'm most likely trans. Every part of my trans identity is intrinsic and not driven by gender norms. I know the facts about my life.

I love how trans imposter syndrome decreases and lasts briefer periods of time once you know the facts and get some confidence about your identity :3

It’s homophobe propaganda ignore it

Good point. The guy had a backstory that really made it plausible that he just thought he was trans because it seemed like the only explanation for liking certain things (he was an ex Mormon, so he might have grown up thinking that the only way to like girly things was to be a girl) and he might have gone through with it bc he thought he had to in order to be trans. He seemed like he was not intrinsically motivated, the way he explained his false transness from back then seemed extrinsically motivated (by clichés, like thinking like a girl, but not exactly his identity). Though I can't know what he actually felt like. And he's a transphobic Christian now, so yeah.

And I have a truly intrinsic motivation. I have dysphoria and euphoria, and they feel very intrinsic. And looking at the facts of my life really reassures me.

yea so he wasn’t trans just a confused asshole, you are