When we refer to science, we see things in absolutes. It's either yes or no. It's objective and not subjective. Thus according to science, there are only male gamets or female gamets. Objectively, you are either a male or a female and in rare biological cases, a Hermaphrodite (two gamets in one body). But when it comes to identity. It's more of a subjective matter.
Let me give you are small example. Suppose you were born in, say Canada, but you feel more at home with Mexican culture. Many people will find it strange, nonsense and offensive. But that won't change that fact that you feel more at home with Mexican culture despite being born as a Canadian. You can even opt for a Mexican citizenship if you had the means but till then you can wear Mexican clothes and accessories or whatever is available.
Similarly when a person is assigned to, say male, they might feel more alive being a female. They cannot change the fact that they are were born as male. But they also cannot change the fact they love being female instead and feel more like themselves. Some opt for surgery while others just choose to opt for feminine fashion and whatever is available. And it's okay. It's okay to choose something that others normally don't choose. It's okay to be different. It's okay to feel like yourself by not confining yourself.
(Please don't bring religion into this discussion. Also I am choosing to be Anonymous but I don't want to be attacked for presenting my opinion.)
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