This is just to explain what is attracting me about vulnerability.

I might not be the right one to answer this, since one of the things I'm in therapy for is not feeling a lot of anything, besides of which I'm a loner, but I have been noticing that within the therapy relationship which now feels safe to me, I crave the opportunity to be vulnerable. I've been trying to figure this out. I think it's because when I feel more vulnerable I feel more alive in general. It's like, the first step to feeling more alive (for me) is to learn to tolerate that I can't seem to open myself up to the more positive feelings like joy without also opening myself to whatever comes. And part of what i want us the joy; to not be so afraid of the hurt side that I miss the good feelings part.

And this is all tentative even just for me. I definitely don't think that what you think isn't valid. What I'm saying could be premature and wrong for me, even. Much less for someone who's not-me.

On re-reading your post I just realized it's not phrased as a request for information. But I don't want to just delete it so, as they say, feel free to ignore what's not useful.