No strategy in games

Mid champions in adc role, top rengar, mid wukong, fucking everybody one shots. If your team picks a normal adc you lost, if your top picks a tank, gg nothing the tank can do against mobile fucking assassins everywhere. What am I supposed to do if I'm a tank main, what's the tank's job right now? If everyone runs past you and one shots your teammates, what the hell do I do?! Not even 2 lockets saves people from this retarded damage.