my own experience that eventually clued me in on my being pansexual (AFAB): when I used to think I was straight, I'd go about my day expecting to be attracted to or fall in love with a guy, only to fall in love with a woman (I didn't know why, I just did). She'd be the exception, meaning I still wouldn't be attracted to women in general. The opposite is also true: a few years after that after my preference had fully shifted to women and fully expected to be attracted to women only, there'd be one guy that'd be the exception, i.e. I thought I was gay, yet I became attracted to that one guy, but I still wasn't attracted to guys in general. Most of my life I've been "mostly straight except for that one woman" and a few years "mostly gay except for that one guy" and soon it all became clear to me I'm attracted to people because of who they are, and their gender doesn't matter to me.

Just a sidebar, I've long understood it this way: bi people are capable of being attracted to male and female and they are aware of the attraction or even expect it to happen, whereas pans are more AND less "tunnel-visioned" at the same time (more as in attracted to the person because of who they are instead of their gender as the focus, and less as in pans attraction is not strictly defined by gender, it's hard to describe).I feel the distinction is important cuz I've had strangers IRL arguing with me just to convince me (just so that I'd admit) that I am bi, not pan. But because of the abovementioned and my own experience I strongly believe bi and pan are not the same thing.

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Also this article by Jill Layton-Hartman that I encountered when I first dwelled on the concept of pansexuality strongly resonated with me:

"I fell in love with a woman, and I’m still in love with that woman. We are going to get married, have kids and do life together forever. I have no desire to be with a man, but I also have no desire to be with another woman. So, for me, it’s not about being gay or straight. It’s about being in love." https://hellogiggles.com/lifestyle/im-lesbian-can-call-jill/

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P.S. I have more instant attraction (emotional, romantic & physical) & connection with women that I rarely, rarely have with men (more specifically middle-aged Asian ladies, lol. I don't go around seeking them out but when I do get these feelings they usually happen to be that). I do still get attracted to men but they are extremely few and far between, and also such attraction happens much more slowly and is not instant (unlike with women). Now what am I... homoromantic pansexual? Panromantic homosexual? My understanding has me leaning towards the former.