I also fog out a lot by playing video games all day but a lot of people do that. A lot of people have a favorite book that they read and think about a lot or a favirote TV show or movie. Everyone has things that distract them from life. It's a form of dissociating yes but it's not "bad".

I'm just curious, when you say your therapist caught you doing this.. thing.. what were you doing? You were watching tv in the therapists office?
Also not being able to recall what you said is actually not significant at all. You are not a computer capable of recalling every detail of every moment of your life. You're a human being and most of us can't recall a lot of things naturally.

Not to be rude but if you actually read what dissociation is then you won't be so confused.
Dissociation (psychology) - Wikipedia, the free encyclopedia