I do that, sometimes more, sometimes less, but I also have a plan what I'll be talking about... With previous T, I had even like scripts in my head what exactly and how I will say it, with current T, I just know which topic I'd like to cover...
I have to practice saying some things in order to convince myself to actually say them aloud... And to cover possible responses so that I won't be surprised Without preparing myself I'd really struggle to talk about worst moments in my life, I guess I'd just sit there in a quiet without saying a word - thus, in my case it helps...