I've had this conversation several times with my T actually. I have the same thing bothering me, I'm not very talkative, I never really know how to start the session, yet, my T almost always waits for me to talk instead of asking anything. I told him I'd rather being led by him, but he insisted that what mattered was what I wanted to talk about, not him and that it was part of his ethics, he lets the patient talk about absolutely anything and only then he starts asking questions, but I have to select and bring up the subject myslef. Although I don't really like it when I don't know what to say and just sit in silence, I actually understand this and I think most therapists do the same. And when I really think about it, I prefer that instead of being led on a subject that isn't relevant to me or has nothing to do with what I really want to say. Only us can know what to say, that is true.