My dog seems scared of me, is there anything I can do?

More than a year ago, my family bought a west highland white terrier. She seemed eager and confidant when we met her, but when we got her home I noticed something off about her. she seemed to cower whenever I got close to her. I asked our veterinarian about it and he suggested playing with the dog and giving it time. She likes me playing with her when I'm down in the floor, she likes jumping up in my lap, and she sleeps with me at night, but still, after a year of bonding, she still hides behind furniture or runs into another room every time I stand up, and if I approach her she urinates herself immediately. She is absolutely unphased by any of our children, my wife, our neighbors or any stranger outside of the home. The only people she gives this kind of reaction to are strangers who come into the house. I understand that I'm a big man, 6'6" and I can be intimidating, but shouldn't she be acclimatized to me by now?