i experienced the same before. reverse psychology, this is what you should do. i did it also and it worked. i just told the boys, they play good and they have the guts to be good football players in the future. i even advised them that in order to improve more, they have to find a suitable and spacious playground so that they can play freely without worrying about cars that they may hit or people that they may hurt. they said, their fathers do not allow them to play in other places that is why they satisfy themselves playing in that area only. after that, i became their friend, and i felt i inspired them a bit.