You seem like a good and reasonable person, and I'm glad you're aware of your feelings and not reacting super negatively towards the existence of trans people over them. I'd recommend thinking through this a bit more sometime.
Sure, most people are only into men or women, but most people don't start off getting to know someone before sex is on the table with a "by the way, what genitals do you have?" That feels reductive and is a major red flag to most trans people. It's similar to how chasers who pursue trans women with a penis as a fetish. We're so much more than our genitals.
In case you ever end up in sex talks with someone who either at that moment comes out as trans or mentions what genitals they have, handle that conversation delicately. Many of us and don't want the genitals we have but surgery is too expensive, but we also don't want to have sex with someone agonizing over our genitals or don't want that part interacted with at all if we do. This is also why many trans people date within the trans community to alleviate these kinds of issues.
AMAB is Assigned Male at Birth meaning typically born with genitalia interpreted as a penis but is sometimes due to parents/doctor choosing if the baby's genitalia is not a penis or vagina.
Likewise, AFAB is Assigned Female at Birth meaning typically born with genitalia interpreted as a vagina but is sometimes due to parents/doctor choosing if the baby's genigalia is not a penis or vagina.