TSH I think I am feeling the same way as you!
I have made at least one really good friend on SR but apart from her I don't really feel as if i can be open with anyone.
I still post because for me, using SR is one of the things I am trying to do differently this time around.
I don't like to post sometimes because I am either worried about butting into a thread, looking foolish or offending someone.
I too feel that there is something wrong with the whole site at the moment, I cant put my finger on it (probably because it is all in my mind !)
I'm pretty sure it is my perspective on things that is wrong so I'm going to hang around for a while longer and hope it changes.