Pocket 6's in middle late position

[mike4bmp]

So tonight I held pocket 6's and it was raise, reraise, and cap before it gets to me...should I have called 4 bets colds preflop with a small pair? These are the situations that confuse me...my hand would have won...with a set on the flop improving to a boat on the turn...but how was I supposed to play it for 4 bets? This kind of thing happens often enought that I thought it was worth mentioning. Thanks!