I'm so paranoid all the time. could this be an anxiety disorder?

Paranoid? anxious?: The answer is most likely 'no.' feelings of paranoia tend to cause anxiety but are nto themselves caused by anxiety. Everyone feels a little paranoid sometime, usually after a very unpleasant event. If such a feeling persists and becomes pervasive, this suggest a mental health issue like schizophrenia, bipolar, or substance abuse.