If you can't keep in mind that you're talking to other human beings who may have deep and good reasons to feel differently than you do on a topic, then please don't post here. This is a difficult enough topic without poisoning it with swipes and snark.
... Except when they aren't. Even biology doesn't paint such a simple picture. Chromosomes are important, but not as important as hormones -- and how the body responds to those hormones.
If you're not aware of CAIS, it is probably the clearest way for you to re-evaluate your view that chromosomes are prescriptive.
https://en.m.wikipedia.org/wiki/Complete_androgen_insensitiv...
Edit - puzzled by the downvotes here. Do you know what chromosomes you have? Have you checked? If you do, there's a nonzero chance that they aren't the chromosomes you're expecting to find.
If you were to test your chromosomes and found they didn't match your expectations, you would either have to change your belief about the prescriptiveness of chromosomes, or your belief about your gender. Which belief would you change? Which belief do you hold more strongly?