Actually, My cave is a seperate room from my bedroom.
But between my "office" and my bedroom, I spend the majority of my time at home in one or the other.
My hermitism got really bad when I was working on-call from home, when you can't leave the house for a week at a time it becomes easy to not leave when you're not on-call.
I've been getting better in the last 3 months or so, venturing out and doing things on weekends, spending more time interacting with my mother, coworkers, and friends; spending less time playing World of Warcraft...
Well, since I made the decision to actively transition, I've found the motivation to get active much easier, because I have a reason for wanting to do it.
Your milage may vary, coming out as trans is definately not for everyone