his wife is only pretending vivid interest in other people`s stories and lives
I'm the chatty Irish woman referred to by the OP ;-D
I can confirm that I am actually genuinely interested in people - but in a casual way. That's an Irish trait. We are
interested in you but that doesn't mean we want to be 'friends', if you get my drift.
Would Poland be suitable just for a chatty expat?
Of course not. But you won't get the smiles, small talk etc. that you're seeking for reassurance. Poles don't crack a smile to strangers very often. On the other hand, if you are introduced to them by somebody they know and trust, then they will be very welcoming and the hospitatlity can be almost overwhelming. If they decide they are going to befriend you, then it's a real friendship, not a casual acquaintance. Of course you don't have to be specially introduced. You could become friends if you work together or are both members of some group like a sports club or a choir. They would gradually get to know you and once they issue an invitation to join them for something, then that's the start of a friendship.
Also, bear in mind, that as Poles are not very chatty and smiley to strangers, they won't expect chat and smiles from you either, so the fact that you're shy won't be a major problem. But the other poster, Kaprys is right. If you have a phobia or anxiety disorder, you need to address that separately.