Confused about my identity as the core

I think I'm the core, but I'm not entirely sure. I have memories of growing up my entire life, but everything before middle school feels like it's somebody else, and those memories look to me the same way it looks as when I'm co-fronting with another alter (for example, when another alter is fronting I tend to be in the background and it feels like I'm watching the world on a screen). I hate looking in mirrors because the body looks nothing like me. My alters have told me I look different in the innerworld but I can't recall ever being there. Hell, I don't know. I thought I was the core, but now I'm just not so sure. All of this is so damn confusing.