If the women here can explain why the millions like me feel like we do from a very young age,
Without being able to know how you as an individual feel, that's difficult to answer. But for a general case, it might be worth questioning whether gender dysphoria is simply a general dysphoria that "picks" gender as its outlet. You have anorexia as a similar example of people who feel that their body is wrong. (And similarly commonly manifests with the onset of puberty). In both cases people feel their body is 'wrong'. In both cases there's a societal aspect to it (thinness, gender). In both cases there is a correlation with autism. Is it possible that there is a non-specific condition and the manifestation of HOW one feels one's body is wrong is largely influenced by social factors?
For example, someone with Gender Dysphoria feels they have the wrong body. That they should have the opposite sex's body. But how do they know what feeling like a boy or feeling like a girl actually feels like? They can't. Indeed, I'd argue based on how often it seems to attach to superficial gender stereotypes, that not only do they not know whether they truly feel like the opposite sex, but that they don't actually feel like the opposite sex. What does it mean to "feel like a male" or "feel like a female"? I don't believe there even are specific feelings for the sexes. You can experience having a vagina. You can be influenced in your personality by testosterone and so on. But none of this is some intrinsic "I've got the right feeling for my sex".
No, the only thing that's established is that someone feels their sex is wrong. Not that someone feels the opposite sex. That's an ideation the comes about in the imagination of the sufferer, not something they know to be real and to match how the opposite sex actually feels.
So I don't know what the answer to your question is, but I believe it's worth stepping back from the starting assumption it's about having the wrong sex.