Bupcakes, I don't think your explanations of the difference between gender dysphoria and transsexual are correct. They may reflect the experiences of your friends, but they are not the correct definitions for those groups as a whole.
Gender dysphoria is a medical diagnosis for people who, at some point in their lives, experience a conflict between their gender role and their biological sex. Not all of these people will actually want to change their physical characteristics through surgery or hormone treatments. Not all of them will be unhappy with the way their body looks. Some of them will continue to have GD, but most children with GD will not have GD as adults.
Transsexual is a form of self identification for people who feel that their gender is the opposite to the one that they were given at birth based on their biological sex, and who want to live within society as the opposite gender. SOme transsexual people have surgery and most do not. Some transsexual people believe that they have always had the brain/hormonal state/other secondary biological function of the opposite sex and some do not.
Transsexual people are a subgroup of transgender people. Transgender people are people who self identify as having a gender identify that is different to their biological sex. They might consider themselves to be male, female or neither gender. Some transgender people feel that they really are the opposite sex (in their brain etc) to their biological sex, and some don't. Some believe they have always been the opposite gender, and some feel that their gender has changed at some point in their lives. Some want to live all of the time and be accepted as a member of the opposite sex, and some want to sometimes be one gender and sometimes the other. Some want to be seen as neither gender.
So Julia Serrano, for example, considers herself to be a woman. She does not want to have surgery on her penis and considers it to be a female penis. She is a transsexual. Another transsexual person will have different feelings about their body.
So I feel many of the statements made by posters on this thread are untrue. Not all transsexual or transgender people have some kind of different brain function or biological womb environment as a foetus. Not all transgender or transsexual people believe that they think the same way as people born with chromosones of the opposite sex or that they have always really been a man/woman. Trans is an umbrella term for many people who are unhappy with various aspects of gender roles or feel ambiguous towards them.
I don't see how people can point out that trans or GD is a medical condition and then call people who deny this condition's existence transphobic and compare it to homophobia. The fact that homosexuality used to be a medical condition is evidence of homophobia in the medical community. Many transgender people want GD as a medical definition to be removed.