I'm claustrophobic in my own body. My brain doesn't allow me to think as much as I would like to, or not like to.
And I can never get all of the experiences I would like, or not like. I can never be all the kinds of people I want to be or not be, and never even read all the books I want to, or not.
(You know you're insane when reality feels surreal and the fictional worlds feel real.)