I think I was in the same place that you were - afraid to share certain things with my T, thinking she would get mad, terminate me, etc... Over the summer I just started saying things like, "I have something I want to share but it's hard for me", "I am feeling really vulnerable right now but I want to be honest with you", "I need your support around something I want to share" - that way my T knew that what I was about to say was going to be a bit hard for me.