I feel like I've dreamed half of my life that hasn't...

I feel like I've dreamed half of my life that hasn't happened yet, so a lot of times I'm going along, and I do stuff, and I know that I've done it. I have deja vus more than I have regular experiences. If half of your day is a deja vu, then you start to wonder, 'What is real and what isn't?'