This could be called maladaptive daydreaming, and lots of people do it. Maladaptive daydreaming usually follows along with creating a different version of yourself in your head. Usually this person is an ideal of yourself. Don't freak yourself out though, I don't know the details of how you feel and it may be different. This could be very far from how you feel.
When I was little I did this a lot. I felt like I was just watching myself all of the time from a godly perspective. Like from the clouds. I always wondered what was even happening, what this life was. It confused me immensely but whenever I floated up to this I felt very calm. Now I use this because it gives me the sensation that I am a very small speck in this big universe. That I could very well be a plant cell on a leaf in a bigger universe- that this whole universe was just some plant cell. It makes me feel like I don't carry a huge burden of being some bulky planet.
If this makes you feel bad, find ways to snap back to reality. Clench an ice cube hard in your hands, this should bring you back. Here's a masterpost of ways to stop feeling numb: http://sal-va-tore.tumblr.com/post/92494769799/the-struggle-makes-youu-stronger-alternatives
I hope this clears things up a bit. Remember to seek help if this escalates to the point of discomfort.