Everybody dissociates. When it hinders normal day to day functioning, that's when it becomes an illness. You know you've dissociated when (like for me) things are "just" done, my husband is mad at me for some strange reason ('cos somebody inside fought w/ him), you lose things a lot. A lot of people have these things, that is normal, but as I said, when it interferes w/ your daily living & happens a lot, that's dissociation as the illness.
Hope this helps.
Love,
RhysMadison