I've experienced it too, but it's not what you think it is. Sometimes the human brain creates false memories. That is all deja vu is. Your brain says, "I think I've seen this before," when you haven't. Also, if you have a dream that comes true, it is either a false memory (you only think you dreamed it, but you never really did), or it is a coincedence. It does not mean that you are psychic.