I don't know if you have ADD or not. Zoning out in particular by itself does not equal ADD. It could just be boredom. For me FOCUS is my biggest problem. It is hard to find something my brain can stay attention on. I will not be able to engage my brain before I move on to something else .

I rarely remember lines from movies as my mind wanders during movies or reading. So like the others said, it is best to get tested for it.

Best wishes

MDD
ADHD
GAD