Hi, My Name Is Shelby. I Am 15 Years Old.

Hi, my name is Shelby. I am 15 years old. I have (in the past) been told i had something like a personality disorder. I have noticed in the recent past few months. I talk to myself at random moments. Its not just jibberish or something that randomly comes to mind. It's me "talking" with people. Creating a fake scenario in my mind WITH my eyes closed. I only do this when i am upset. My mother is a medium. I have someone always following me. I cannot hear them but i can feel. I only want to know WHAT i should do..