-Does everyone occasionally fantasize about being the opposite gender?

Well, yeah, I think so. It makes sense to be curious about what it would be like to be something we can never be(excepting with new surgeries of course). I think fantasizing can be a healthy way of exploring our ideas about something. The problem comes when we obsess over it.

-Does the fact that I sometimes wish I'd been born female make me a closet transsexual?

No, I don't think it does. If it is only happening sometimes and not taking over your life completely in that that is ALL you want to be.. then I think this is probably a normal reaction to have.

-Do other people get excited by imagining what sex is like for the opposite gender?

Sure, I have. I think its part of sexual fantasy in the same way that most of us have had crushes on the same sex as well as the opposite sex - that doesn't always mean we are bisexual though, just sexual creatures.

-Do other people get a bit jealous of the opposite gender's strengths/assets?

ABSOLUTELY!!! all the time I think I see this happening all over the world. It probably played some role in womens liberation - women probably were a little jealous of the strengths and skills that men had and pushed to get the same ones. The same could be true for a man of a woman. A man could be jealous that he has trouble identifying with his feminine side.

Its possible your anxiety could have something to do with the fact of your history, but I truly beileve in general that these are pretty normal thoughts to have.

I would ask yourself - Does it take over your whole life? Do you find yourself dressing like a woman constantly? Do you find that you FEEL like a woman in a mans body?

Is it affecting you so much that you are sure that if you could, you would become a woman?