I wanted to pull myself for more conversations with strangers (like buying smth in non-supermarket shop, when i have to say what i want, or go to the restaurant and order smth) but like you say, its easy to say (lol, thats sounds kinda ironically) but hard to do. When I am in situation like this, i just feel that i can't do that. I was few days ago in classic big shop, and i have troubles to say stupid ,,hello" to cashier.