Yes.
How long have you had your turtle?
A lot of times "new" turtles (mine took months to get used to me), are under a lot of stress from changing environments etc. Turtles take a while to adjust, some are never truly "friendly", my turtle Leo pretty much uses me as her food source and not much else

. It's pretty intimidating to a turtle to see this big head hanging over their tank, so don't be offended if your turtle runs back into the water when you enter the room, it's just their natural instincts.