There are no TWO things alone in this universe. Hot/cold, light/dark, there is a million degrees between the two, the same goes for gender. (Thats a pet peeve, the distinction between sex and gender in the media....)
What is it like?
In life there are 2 streams of people, male and female, both on a long (for some) walk on a fairly level path parrallel to each other. We on the other hand walk between them.
(MtF) The male on the left is higher than female and our path is broken and uneven, gravity draws us to the female. It can be a struggle to remain walking with the guys, but eventually we dip down to the female, then back up to the male.
Its exhausting and depressing not to fit in, a struggle daily. GID is our gravity in this scenario.
Some can continue on this path, others cannot. I found I could not.
As for myself, I am doing better now that I realised I am different and seperate from the others on the same path. I no longer follow the rocky course with its ups and downs, but set my self on a cleaner, more even path. That path still has its ups and downs, but its my path.
This is how I explained it to my brothers. Close your eyes. See your self as you are, how you interact with the world. Now open your (menta)l eyes and look down at your body to see your spouses body. Change your perception as to how you would interact with the world. If you are a male, react as a female and visa versa. Do this every day, develop habits to overcome the "inappropriate" behaviours.
GID just generally sucks in our society.