Am I sick help?

I'll start this directly, Sometimes I talk to myself I talk to someone else but just in my mind I mean I don't say any heard words it's all in my head.. but I know that that person isn't real. I know that I talk to not real personso does that make me sick? or Am I just so lonely and depressed so I created a person to talk too?
I have had depression for the last 3 years by the way.
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I'm 18 years old.
Am I sick help?
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