I think getting help is a very wise idea. As you said, you created an imaginary world and it is becoming increasingly difficult to distinguish the difference between what is real and what is not. That is something you also experienced as a child. If I could interview you in person, it would be helpful to know more about your childhood. Sometimes children who experience trauma or very difficult childhoods create an imaginary world because their real world is too psychologically difficult to handle. The imaginary world serves as a defense mechanism to protect the child but problems can develop when an individual has difficulty distinguishing between what is real and what is imaginary.
You also seem to be experiencing paranoia. The idea that someone is stalking you may be proof of this. The fact that you believe that other people are reading your mind may also be indicative of paranoia. It may be also a symptom called thought withdrawal which is the idea that people are extracting your thoughts from your mind. Thought withdrawal is a delusion that is associated with some psychotic disorders. Paranoia is also associated with psychotic disorders. There is no way for me to know with certainty if you are experiencing early signs of a psychotic disorder. The only way to know for certain would be to have a psychiatric evaluation.
You also mentioned other concerning symptoms: you don’t feel real; you don’t feel that things around you are real and sometimes your body feels unreal, as though you are looking through someone else’s eyes. These may be characteristics of depersonalization, derealization and disassociation. Depersonalization includes feeling disconnected from one’s body. Other people describe feeling as though they are observing themselves outside of their body.
Depersonalization mainly involves having a distorted perception of one’s body. Derealization is a feeling of being detached from one’s environment. Disassociation is an emotional deattachment from the mind and sometimes the body. Depersonalization, derealization and disassociation are often related to a history of trauma. Coupled with the fact that you have created an imaginary world, (and have done so since you were a child) the possibility exists that your symptoms are due to a past trauma. You did not mention a history of trauma but given your symptoms, it is a possibility.
The fact that these problems are causing you distress in your everyday life means that it is time to seek treatment. As you noted, they are interfering with your relationship. I would suggest seeing a therapist for an evaluation. You may also want to consider seeing a psychiatrist for medication. The combination of medication and therapy could help you deal with these issues. I would specifically look for a therapist who specializes in dealing with trauma, post-traumatic stress disorder or dissociative disorders. Please click on the find help tab at top of this page help you locate a therapist in your community. Please take care. I wish you well.