Hm. Well, no laughing, but here are some things i do that seem to get it started and feelings moving.

i write a letter to me about how i feel about me. For examples:
"Dear Solarwind, i hate you and you make me want to vomit. You should never have been born because you are waste of space. Do you know why you are a waste of space?"
"Dear Solarwind, you were smart today when you got all your math questions right. Congrats to you! i never really feel smart and mostly i feel stupid. all my life i was told i was stupid. "

And then i go from there. It usually opens up alot.

Also, sometimes i start by choosing a color or a letter or a number and go from there.
For example: "Today i am choosing the letter A. Immediately this is very easy for me to write about because A=alone and i feel alone all the time. i have no family which makes me really different than everyone else. In fact A=Adopt and i wish someone would adopt me like you T."

See?