BaksAspen, I just wanted to say I had a similar experience like that, maybe not just like yours but something similar.
Sometimes, like after watching a character on t.v. or being around somebody who's personality that I start to adore, I will start to pick some traits from them.
When daydreaming, I'll imagine some scenario either relating to real life or totally imagined and my mind set and self image becomes exactly like them and it will go on to an elaborate scene.
Sometimes in real life, I'll take on that persona and become it and change my whole self and talk like they do or mimic their habits whether either good or bad. Like if the person is really confident and open, I will be like that for that moment or day or if they're really quiet and awkward so will I'll be...
Personally, I think I'll agree it's way of coping with things. Like for instance when imagined I was someone else who was much thick skinned, colder and malevolent... during a bad break up.
Im my view, it's not that bad only if it's starting to affect your life in a negative way significantly or at least that's my opinion.
Thanks for sharing btw, sorry for the typos.