I also feel similar. I don't think I really exist, like I'm just some omniscient narrator. I don't have much attachment to my gender either because of that, and I'm asexual. I tried to participate more in activities to make that feeling go away, but it only got stronger as the years pass by.
To cope with that, I try not to think about labels too much. Go for what you truly feel. I'm cis, but would like to get a nullification surgery one day. What the LGBT is about, is making you feel comfortable, making you feel like your true self, no matter how weird or unexplainable it is.