Lots of us feel differently, Del. We often attribute the differences to hormonal actions and some of that is just about bound to be correct. "Ego" I would imagine is not one of those things.
Both women and men have "Ego." If you read enough here you will discover that to be true. Androgynes also have "Ego" as can also be easily verified with some reading on these pages.

This series of
excerpts from a 1992 book is definitely not medical and may give you some understandings. Heck it may give some of us some as well.
There do appear to be certain inclinations that are hard-wired within women and men as the excerpts say.
There have been other, more recent 'brain sex' books that are generally avaibale to the general reader. I'd suggest checking Amazon to see if any are interesting to you. If they are, check at your local bookstore and sample them to see if they might meet your needs.
Good luck in your research.

Nichole