What does it mean when you feel like you're living in a dream?

Depersonalization disorder is marked by periods of feeling disconnected or detached from one's body and thoughts (depersonalization). The disorder is sometimes described as feeling like you are observing yourself from outside your body or like being in a dream.

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Subsequently, why do my dreams feel so real?

The parts of the brain that are active when we learn and process information in the real world are also active while we dream and replay the material as we sleep. And so, a lot of the things we see, hear, and feel in real life show up in our dreams. Dreams help with processing our memories. What happens to the brain during dejavu?

How can we tell the difference between real and false memories?

True memory is the real retrieval of an event of any nature, be it visual, verbal, or otherwise. True memories are constantly being rewritten (re-encoding). On the other hand, false memory is defined as the recollection of an event that did not happen or a distortion of an event that indeed occurred. Correspondingly, what happens in your brain when you have déjà vu?

In respect to this, is it true that by the age of 16 you will have already met your future spouse?

No, it's not true. At 16, you are just in the throes of puberty and only beginning to learn how to be an adult and even if you do bond with someone so strongly, both of you have to find a way to grow together because you will change as you get older.