Free will doesn't exist

I'm pretty sure seeing the future is impossible as the mere fact of seeing the future changes it and thus the future you are seeing would change and so on or you could just see a possible future but that will never happen in your future (in other words the future of a parallel universe).

I've seen the future in my dreams a number of times. When i finally arrive at that place in time, it is sudden and recognizable deja vu.

The problem being, when i see these things in my dream, they make little to no sense. I'm usually in a place i don't recognize with people i don't recognize doing things i didn't think i'd be doing. Then a few months or years later, boom! There i am. It's weird going through life with my view of life, knowing that whatever decision i make is the one i was always going to make.