Help me ,need help......?

Ok this is hard to explain.Alright well i have become extremely paranoid lately but to the extreme.Not like someone is watching me,more like every one is watching me.It feels as though every one is playing a part in my life .Not like truman show though,more like every one knows every thing about me and knows what to say about me.Well any way ive been having these thoughts for awhile but the worst part is i know its impossible,yet i constantly find these thoughts interfering with my desicion making .I dont know how to say it .I dont use drugs and i havnt smoked weed in months.What is this .Please help