For me it has always felt like that really good friendships take quite some time to develop.
I know my best friend since we are 3. So we know all from each other. But... although she listens it is sometimes hard for her to understand. I don't think that I would have understood before experiencing all of this myself.
The only other friendship I have started to develop that does understand this kind of thing is somebody from group who has left the group. Therefore we were allowed to make contact. The difficult part here is though that we talk a lot about therapy and our health issues and that can be very heavy sometimes. I guess we still need to learn to also connect on the "normal" level.

May I ask if you are only lacking the support in your friendships or are you missing friendship altogether?