I too am very childish.
Idk if it's the trauma/PTSD that causes you to revert to childlike manners or if the coping mechanism is so solid that you would regress to an age where you didn't particular understand stress and can relax but I'm wondering if you have dissociative episodes that can last days. Is that a thing?
Does time even seem real?
Idk but i feel ya on the regression thing