Stop in for a cup of coffee

My batch of Canadian Blonde isn't happy. It didn't carbonize. Usually after a few days the plastic bottles are hard as a rock with co2. Not so. They are as flat as a board. The stout is goid though. I t has been a few weeks. I bight have to open one up to see if it's good.
Last 3 times I made beer it turned out bad and hopping to try it again soon.