I'm like that too. Reading this made me realize why I need to interact with people and/or get out and do things. It helps me focus. If I'm alone for too long or if life gets boring and staid, I dissolve into a fog. I feel less real, even. In other words: "How can I know my opinion before I've told it to my friend?"
If you've read Mrs Dalloway, it's a bit like that - this feeling of dissolving, becoming vague, and then focussing and making oneself real because one has to interact with people, make decisions, do things. Only Mrs Dalloway dislikes it, and I like it.
I hope that makes sense.