Hi incognito... I'm sorry you are so frustrated over this. I also do this at times. Not often but I seem to need warm up time and then (especially with my current T) time is up! And I'm angry at myself and frustrated and scared. I get scared that I cannot "do" therapy the right way and I feel stuck and paralyzed and my anxiety gets ramped up and no good at all comes from this.
A few things that I have realized....first... perhaps I am not yet ready to do abreactive work (the deep trauma processing stuff) and I still need time to develop the trust with my T that he won't abandon me, reject me, or get angry or disgusted with me. So I have accepted that I'm still in stage one which is building the basic trust and comfort with my T. This, according to research, is the longest stage and often the most difficult for those of us who have been badly wounded or abused.
With the help of my T we have realized that I have SO much anxiety when I go in to see him that it blocks me from telling him what I need to. It also blocks the attachment at times... especially allowing myself to feel the care from HIM and allowing his attachment to me. It's so hard to take in his postive feelings for me and I just don't know what to do with them... we are working on this.
So for now, to take some pressure off, we are just doing some background/history discussions. I'm telling him about me, the less threatening things that he does not really know. Some of it is light and some of it are small vignettes of sad/bad times as a child. This allows me to test him and see that he is safe and it also gives him what he needs (informtion) in order to best help me heal.
So maybe you are just being to hard on yourself and expecting too much. It could take years to build to the level of trust where you can walk in and just spill all you need to say. Maybe it's okay for now to just stick to day to day issues and occassionally throw in a vignette from the past. Is there a reason you are pushing yourself so hard? Are you in a rush to get out of therapy? I can understand the need to move quickly if you are in pain but then again, you don't want to overwhelm yourself either and end up in a very dysregulated state.
My T tells me that nothing I tell him is useless or wasted stuff. I'm working on believing that and in believing that it will get easier in time. I wish you could believe that too.
Sending big hugs
TN