One of the things that is difficult for me in any new relationship is trust. So every time I have had a new therapist over the last 20 years, that has been a hurdle. Something you said about saying too much at first reminds me of a premise taught by adult children of alcoholics literature. Trust is not an all or nothing deal. When you disclose to anyone, and I think this includes a therapist, you should see how they react. A therapist should be respectful of anything you tell them. If that seems to be happening you can go farther the next time and see what happens. I think I made a mistake for a long time thinking in a therapy session I should just go ahead and let loose, trust is a given. Well therapists are people like anyone else, some are trustworthy and some are not. Woe to us who find out the hardway.
I don't know if this helps skittles, but as usual I learn from the questions here at Psychcentral and usually take another step in understanding myself.