Not that I am fighting your analysis but I am also very J at home. Except when I make the concious decision to abandon my routine, such as last week for example.
And that's my point, doggie. Is personality under conscious control, or that which comes out when you're relaxed?
I think you're under some kind of stress which is morphing you into your shadow processes. But you can't use them really well. Hence your confusion and the need to straighten out what type you are here - without internal clarity, you're not able to find that external path out of things, is it?