Here, let me make some clarifications and explain things before you all start questioning your manhood.
There are 3 things that combine together to give you your self-image. Your gender identity, your sexual identity, and your sexuality. Gender identity is basically your personality and how you present yourself in respect to societal archetypes of male and female behavior. Sexual identity is pretty much which parts do you want to have. And sexuality is who you'd like to plow =P
They're all related but none of them are actually connected or correlate to eachother. You can be very feminine personality wise but still identify as a straight male. Or you could be a really girly girl and be lesbian. Sexuality has nothing to do with sexual identity, nor does it have to do with gender identity either. They "seem" to be related because societal pressures tend to force people to change one or both of the others in order to match society's expectation of the "typical" combination. Hence why I may not completely hate having male parts or having female pronouns, I will get a sex change because of societal pressures against an effeminate guy, same with changing my gender.
As for the difference between transvestism and transgender/transsexual, my line about "want vs need" I wanted to explain a bit more. Transvestism is a fetish, not a disorder. You basically derive some sort of pleasure from dressing up and/or as the opposite sex but do not actually detest the state your body or presentation to society is. There's drag queens who have gone as far as getting sexual modifications like breast implants and stuff but still squarely identify as guys, it's not that strange. It just has everything to do with desire. If you desire it for pleasure, it's TV, if you desire it because you feel "wrong" somehow, then it's TG/TS.
