Can you bring up with the group (if I remember right) that they were saying you weren't sharing enough and they wanted you to trust them more and share more. But then say, that you are trying to share more, but aren't getting the support you need. And because of that it makes you not want to share anything. You have tried to do what they suggested, and have not gotten the support that you provide to others when they share? It seems like you are doing what they asked, and they are just not being supportive? Ask them how they would feel if they shared and no one was supportive, especially when someone wanted you to share.

I'm so sorry you are having such a hard time w/ group T right now.