How did you figure you were a they/them? If too personal, feel free to ignore this
Yeah, no problem, I'm opening to answering this!
To be honest, it took me a LONG while to figure it out, even though when looking back on it a lot of signs were there (I was in my late 20s when I sat down and slowly put the pieces together). The main one being that growing up I never really liked things associated with my assigned gender. I would also often wear clothes more commonly worn by the opposite gender. But aside from not having the vocabulary for or knowledge about what I was feeling at the time, I think the thing that kept me back the most from finding out that I was genderqueer was the fact that I never felt particularly dysphoric about my body or myself. I'm still pretty happy with the body that I happen to have been born with.
The "ah ha" moment was realizing that it's gender euphoria more than dysphoria that is an indicator of gender queerness. I realized that folks "mistaking" me for the opposite gender made me really happy. I got kind of excited that I could confuse people in that way. Online, using "they/them" for people you don't know is much more common, and when I saw people using those pronouns for me, that also made me feel happy.
Though, to be clear, I'm actually fine with people using he/him and she/her with me as well. I prefer they/them in general because it is the most ambiguous pronoun set, and I like the anonymity it affords me when online, but gendered pronouns are cool with me, too (I know that's not the case with everyone, but that is the case with me).
What I've found is that it's kind of like how cats are with boxes. I hated being forced into the box of my assigned gender. But if you just left the box out, along with boxes of other pronouns/genders, I might hop into all of them from time to time if left on my own. I think the importance is more if it's my decision to play in the boxes or not. Otherwise, I feel no need to really present as any specific gender. I'm not one for that kind of "performance" so to speak, I like just being me and comfortable in my own skin.
So in short, it's the combination of not really liking the box that I was placed in as a kid and feeling happy when people refer to me with gender neutral pronouns that made me realize that I was non-binary. Everyone is different, but those were the indicators for me.
Hope this helps anyone questioning or just interested! Thanks for the ask!