No, this is totally normal for most artists. Visualizing what you want to draw is a key step in fleshing out composition and getting yourself "excited" about the picture you're about to create.
It *is* a talent though. Just because you're not psychic (unfortunately), doesn't mean you don't have a talent for visualizing your pictures in more detail than most people.
If your eyes turn white and you go into a trance and start painting things from the future (Matt Parkman/ Heroes style), then you can start considering the possibility that you're psychic. ;P
'Cuz life is full of your regrets, and I should be one...