Does your gender or sex define you?

[Cavernio]

Poll: If you were to wake up tomorrow morning, and you were the opposite sex, would you forever after have identity issues?

My answer to this question is No, but I'm pretty sure I'm a minority. How much someone's sex or gender defines someone has always been interesting to me, especially because I feel like my sex largely defines me only for sexual purposes. Sure, if I were a man, my current relationship would likely fall apart and that would suck a lot, although I'm presuming I'd still like men. I think I'd end up being a gay man, but outside all of the romance and sex and dating, I truly believe I could go on being myself without much of an issue.

Now, the fact that I think most people would have serious problems having their sex changed, I can think of 2 fairly separate reasons why. 1) You would feel like you're in the wrong body, and this would affect you in everyday situations, because you no longer portray the inner identity that you have for yourself. 2) You would actually be much like myself, in that you don't feel like your gender much defines you one way or the other, but the fact that it would screw up your sexual relationships would just be too much. In this case, your romantic relationships are so integral to your life, and define you so much, that having them likely fall apart, and that you may never be able to be comfortable in such a relationship again, would be traumatizing.

I see 1 as being very different from 2. I could see myself in situation 2 in fact, at least if I had kids or something. But situation 1? Not really. When thinking about what defines me, I rarely think 'I'm a woman' first. I think 'I've had depression, I love what music can do to me, I love to learn, I strive to be open-minded.' I could be wrong here though, and if I were to have my sex changed, I'm just deluding myself into how much it would affect me.
I'm fairly certain I don't want to be a man, just that I wouldn't mind being a man. I don't mind being a woman either. I'm definitely not gay or bisexual though. Never fallen in love with a woman, don't get turned on by women.

I'm also coming at this very one-sided. I've never talked to anyone who's got gender identity problems, and only recently found out that someone here has them. I want to make it super clear I don't mean to offend, especially if I obviously don't 'get' something. Maybe all the stuff I said in the earlier paragraph isn't actually true for people who do feel like they're in the wrong body.

I think I have women's rights movements to thank for feeling as I do though. There's nothing that I want to do that I feel I can't because I'm a woman, and although I was raised with gender roles for many things (I'm still slightly bitter that my brother got to cut the grass outdoors and I got to clean the bathrooms, thanks mom), I was never under the impression that there was any field of work I couldn't get into because I'm female or anything like that. (Although now that I'm older I know this is not always the case.) I mean, if I felt like I being a woman meant I had a specific role in life, or that being a man meant I had specific role, I could see myself not feeling the way I do now.