Do you ever feel like life isn't real sometimes

Like when you think too deep and then everything starts feeling weird and not real? Like it's from a movie you look around and it feels like you're looking from the outside. It's such a weird feeling even though it lasts only a few seconds. I can make this feeling happen on command if I concentrate and it comes at random times and I want to know if I'm the only person that experiences this :/  I hate it  and I always want the feeling to go away