Its an inverted form of attention seeking because they think we will be kinder to them without their having to make an effort. We were told that shyness was just an act when I was at school and to ignore anyone playing along and Ive always believed it.
After all if you want something or need something you should go out and ask for it, but a shy person will hope others will help them or ask on their behalf.
I have a friend like this, she will not go out, her friends have to come to the house and ask her, she still wont go, then her friends threaten to drag her out and eventually she gets dressed and goes unwillingly with them for a night out where after a while she enjoys herself as they all go to the bar for her as she is too shy to go , they bring her food as she wont go to a buffet alone and they have to take her home as she is too shy to go on public transport.
My elderly mother always said she would never go to a bar alone as it was always a mans job to seek drinks so I told her if she would not take her turn she would sit without a drink or food, the next time we went out she queued at the bar like anyone else. I really cant stand shrinking violets, why should I put up with it, no-one would with me!!!