I am so checked out from reality I forget I’m real sometimes

I daydream constantly. I have this made up version of my self in my head that I’m constantly thinking about. I forget that it’s not me and that I’m actually a real person who needs to get a job and good grades and shit. I don’t even know where to begin with stopping this derealisation. I tried talking to my parents but they just don’t believe me. I don’t feel real as I’m typing this. I don’t know what to do man