Bit of an odd question.

I'm a writer, but I am also an extrovert (don't know if this is rare or not, haha).

I sometimes find it very hard to convince myself to sit down and write, even if a story is just begging to burst free. I don't like to just "sit down" at any other time, if I do I feel restless.

Anyone like this? What's the cure (unless the cure is some extreme self-discipline...)?