If you were born a woman and are comfortable with that identity
First of all, woman isn't an 'identity'. It's a biological and physical reality for 51% of the world's population. It involves periods, pain, childbirth and menopause. No, not all women go through all of these things. But only women can. And just because you experience these things, it doesn't mean you have to wear heels and love pink and grow your hair long. You can choose to break down gender stereotypes while not denying your biological sex.
When you describe woman as an identity, I think you're confusing sex and gender. Sex is biological and the basis of female oppression. Gender is made up and the tool with which women are oppressed.
I'm a woman, but I can't say I'm 'comfortable' with the gender roles forced on me because of my sex. So what does that make me, according to your ideology?
I've met a fair few 'non binary' people. They have all been, without exception, attention-seeking narcissists. And I would say gender identity ideology only serves to reinforce sexist, regressive stereotypes even further. If a person with a vagina refuses to meet society's gendered expectations of her, she's not a woman? Come on. You're really not the revolutionaries you think you are.