Nature loves variety. Unfortunately, society hates it.
It is highly likely that you have passed a transgender person on the street, at the grocery store, in the bank, at the gym, and, yes, even in a public restroom, without even knowing that that person was transgender.
A transgender person is not just a clone of another transgender person. He or she is different and unique, just as is every other person.
Transgender people are those who transgress gender norms of society by attempting to transition into the correct gender of which they should have been born.