What to do if you don’t know yourself

I’ve spent my entire life dissociating from life and going into my fantasy world. I spend about 80% of my time dissociating and never really going into myself to be able to figure out what it is that I am feeling and who I am. Recently I decided to start spending sometime with myself and just sitting with myself and I soon realized I don’t even know who I am. It’s really uncomfortable. Often when I went into my fantasy world, I acted as a third person. It’s called maladaptive day dreaming. It’s a trauma response. Since I’ve been this other person for so long I don’t even know who I really am. It’s like I’m a stranger to my own self. I don’t know if anyone relates.