Ooh, I've got some. (Coming back up here to say, oh man, this got a bit out of hand, I didn't realize I had so many examples...)
I've also never had a crush, didn't get the idea of "celebrity crushes", etc. I once got asked who my first crush was and I said, after a moment of consideration, that I liked the flea off A Monster in Paris. I dunno if anyone else has ever seen that movie (if not: movie about a flea (in Paris!!) that gets turned big in some kinda accidental science experiment. It turns out the thing has great musical talent. Yeah. It's a good movie but I don't know what was going on either). I don't know why I picked it. I think my instinct was to just treat the whole situation as a joke. That flea did have some pretty dapper outfits to be fair.
Then I had some guy tell me when I was 11 that he thought I was pretty and he liked me. I was just like yeah, right, sure you do, and told him something along the lines of "dude, we're 11. What are we even gonna do if we start dating? Go to Tesco while our parents wait outside?" He cornered me in cooking class a while after that and asked me AGAIN if I'd go out with him, which I said no to, and then after that, he started being mean to me. Real charming fella.
I forced myself to have a crush on Sirius Black from Harry Potter despite knowing at the back of my mind that I just thought he was a neat character.
I stated outright to my best friend at the time (12 years old) that people couldn't have "real" crushes in primary school, because they were too young to know what love was (I assumed it was a conscious decision).
I was also the kinda person not to get why people didn't just break up. I would always be like "told you so" (mentally, not verbally, thank God) when relationships ended. Or if someone was sad, I wouldn't get it, because surely if whoever it was broke up with you then they're not the "right person" anyway. My aforementioned best friend had a rocky relationship and subsequently broke up with their online girlfriend, and then came to me afterward all miserable, saying it was all their fault, and how they felt so guilty. I was just like man, she wasn't that great of a girlfriend, who cares that she's gone? Good riddance.
Before this, Best Friend would constantly slide "X just flirted with me 😳", "I flirted back with X", "She called me cute OwO", my girlfriend this, my girlfriend that, etc. into conversations. Logically speaking, of course they'd assume they could tell their best friend about their relationships. I mean, who better? But I was just so disinterested and annoyed whenever it got brought up. I feel kinda bad now looking back on it.
OK, final thing, I swear I'm almost done: I never understood the way that people instantly changed their mannerisms and habits after getting into a relationship. This was one of the things that made me skeptical that anyone was really experiencing crushes, and not just putting it on because that's what everyone else did. For example, people I knew would get into a relationship, and where before they'd hold normal online conversations, now every chat message HAD to be followed by a heart emoji, or an "ily/ilysm". Or they would instantly set their phone background to their partner's face. I sat next to a girl in my Year 9 science class (12/13) who printed out her gf's Instagram profile picture (speaking of, why is it always Instagram???) and inserted it into a keyring on her schoolbag, which she would then continuously take out to look at. Even now I'm not sure whether that's normal crushing behavior or whether it's weird even by alloromantic standards.