I hand raise all my chickens from day-old chicks, and that really helps to make them friendlier, but once they're grown and in the coop outside, they do seem to become more independant.
One idea is, at bedtime, when they go roost, I go into the coop and talk to them softly and pet each one.....this is when it's not really dark yet--dusk I guess, and they're calm and quiet.
I don't pick them up, I just talk to them and pet them a bit.
Out of 19 chickens that I have, there are three that are super friendly, that I can literally pick up anytime. I guess it is kind of normal for your chickens to be shy.
Don't let that bother you.