I have an imaginary friend. He doesn't affect my life much but it's making me feel uncomfortable sometimes and unsafe.. how do I get rid of him?
Seek medical care
If you are 18 years of age and have an imaginary friend that only you can see or hear and do not feel comfortable about this you know you should seek medical care with a Dr. It would be important for the doctor to be made aware of all current medications taken in addition to other non prescription substances.
If you do not feel safe you need to seek immediate medical attention in an ER/hospital.