I don’t want to be a man

I just don’t know what to do. I am constantly in these spirals of "what if I am all making this up" "what if its just internalised misandry" and it all makes me so terrified and scared. I don’t want to be a man, I just want to be a woman. Why can’t there be just this big 100% certain diagnosis that tells me I am? Why couldn’t I be born a cis woman. I am so tired of these doubts coming back at me. For years and years in my life I wanted nothing else than to be a girl and ever since I am on HRT my mind just keeps going back to these doubts. Suddenly there is days where I don’t know what I want to be anymore. There is days where I am wondering if I would be happier as a man. But then I remember I like female pronouns and my female name. I don’t want to be happier as a man. I want to be happy as a woman. The thought of not being a woman at heart terrifies me so much and I just don’t know how to make these doubts stop. I like what HRT is doing but my mind is second guessing itself constantly.

edit: thank you guys for all your lovely answers! It really helped me to calm down a bit and gave me stuff to think about. I am a woman and that is an anchor I will cling to.