Janet, we sound very similar in some ways. I was always (and still am) a science nerd (but there were no computers when I was growing up, but my first computer, which I still own, was a Timex Sinclair 1000... look that one up!), did the whole comic book and Monty Python thing, etc.

The word "transgender" didn't exist back when I was four years old and realized I was supposed to be a girl. That's the way I always expressed it, even to my mom. I never hated myself for it, or dressing up, but I can understand why others would. I hated that I wasn't a girl though. I did keep it secret for the most part, but that's just how I am. When I was a teenager I accepted the fact that I was a "transsexual," which was the current term used.
I never got into guy stuff, but I was never effeminate either. I always disliked sports (except for maybe tennis), I used to sew and design my own clothes, make ceramics and jewelry, paint and draw, etc. I worse nail polish, and occasionally eye liner, all throughout high school, and what ever girl's clothes I could get away with (i.e., no dresses!). It was he 70s, so I was very much into the glitter rock movement. I had very long hair. People just got used to me being different.
I just recently broke the news to an old girlfriend of mine. We lived together for almost 5 years back in the 80s. If not for the very rock n roll lifestyle we lived (sex, drugs and alcohol, not that the sex part was bad), I'm sure we would still be together. She actually sent me a message on my "regular" Facebook profile and said "just curious, are you a cross dresser?" lol So I said "yes, and no," and explained the whole thing, and apologized for not telling her 28 years ago. She was very supportive and said:
"when I was in London you told me you tried on my black and blue lace strapless dress. Honestly none of that ever phased me, it still doesn't. Your mom was the coolest. Maybe she didn't get it but I'll bet if she did she wouldn't have cared. I never found you to be effeminate in any way. It's sad that you've lost friends over this. People are people, the heart is the heart. I'm happy you felt comfortable enough to tell me."
(I had forgotten all about the dress incident! I used to wear her clothes all the time, we were the same size and she had the coolest stuff!)
So it's funny, I'm not effeminate, but lots of other people, including her at some points, and my ex wife, would say I reminded them more of a woman. My ex wife used to tell me not to stand certain ways and comment on my mannerisms ... I was totally unaware of it. I also used to set off some people's gaydar, until they got to know me.
I think being overly effeminate is over compensating, because most women do not act that way, unless thy are super ultra girly. And that in itself is kind of a ruse. But men and women do act differently, and it's probably mostly social conditioning.