I do the "I have something that's been bothering me but I can't bring myself to talk about it" thing too. It works pretty well to sort of trick me into talking about it. Talking about it being hard to talk is a great and valuable use of therapy time.

I'm better about this now, but it's excruciating at first to say those words -- "I want to talk about something, but it is too hard to talk about." If you can get JUST those words out of your mouth, the rest of the session usually flows just right. It's almost like a cue for a T to gently search for the thing that's troubling you.