If it tasted flat and 'not-sweet', then all is well.
The only real way to tell what is going on is to use an hydrometer. I'm assuming you don't have one.
Before fermentation the wort is essentially a sugar syrup, and tastes really sweet. The yeast then convert the sugars to alcohol, and it gets less sweet.
When you carbonate it (bottle it) the carbonation will make it feel fuller and sweeter.
Leave it at least another week before bottling, It is worth leaving the beer on the yeast longer to allow the yeast to clean up some undesirable flavors.