Mine all used to be terrified of me. Four were purchased as adult ducks, one as a duckling, and four were hatched here Momma ducks (so seemed to take on their fears). (My one purchased duckling came from a home where I think she got a little more attention than some ducks do and so she's actually been the calmest overall.)
They hadn't seemed very interested in foraging this summer so recently I started feeding them just in the morning and evening and only what they will eat up in about ten minutes (I read somewhere that that keeps them from being over weight). Now, when I bring them goodies, they are much more interested in me and they actually approach me in the afternoons as if to remind me that it's time for food.
We also take 'walks' a couple of times a day. I slowly "herd" them around the yard a couple of times and, though they don't actually follow me yet, they are starting to act a little more like we are 'walking', rather than as if they are on a desperate run from my presence.
I also recently obtained a Silky drake and an East Indie drake. They are in a separate pen with two Silkie chickens. They were initially really scared and hid all the time, but after about a month they are now out looking for food and fresh water in their pool shortly after I go into their pen each morning.
So have patience and hopefully they will come around.
p.s. When my mother is over she talks to them in the calmest sweetest voice and they all stop and listen. I try, but I think my voice is more irritating and they just aren't terribly interested in whatever it is I have to say (though the dog and cat are happy to listen to me babble on and on about nothing at all).