Please help me

I don't feel like myslef. Yesterday and last night I felt like myslef. But when I woke up this morning I just don't feel like me. I followed my normal routine but I still don't feel like me. Everything feels different and I feel like I'm out of my body or something. I feel empty or as I'm in the back of my mind or something? I feel like I'm in a dream world if that makes sense? I just feel completely different. Also I feel like I don't know my family or anyone I ever knew. I feel like a dream and everything isn't real. I feel like my thoughts aren't real.  And I feel like I'm not real. I feel like I'm dead and In a fake world. What's going on with me? I'm mentally stable and I don't have depression.