How to overcome imaginary thoughts and self-talk?

Hello doctor,

I am an 18-year-old girl, and since I was young, I would lock myself in a room anytime I felt like I needed to detach from reality. I would turn music on and talk to imaginary things, pretending I was in a different place, which I think is normal for a kid, but for me, it never stopped. It has been years now, and I probably do this once daily, and they are not even imaginary people. They are the people I know and live with. I imagine saying things to them and acting them out, and it makes me feel good. I never talked to anyone about this. Lately, I catch myself talking to myself out loud, but since I am always aware of what I am doing, I thought I should not be concerned since it relaxes me. But I am scared now, and I might need help. I just wanted to tell someone and get an opinion once, as I never spoke of this before. Please help.