Let me guess...if you foloowed basic kits instructions you didn't use a hydrometer to take gravit readings, rather you let it ferment for 7 days or until the airlock stopped bubbling, then probably transfered it to a secondary for a few days (maybe) botted it and opened them after a week in the bottle...
How close am I to your situation?
The biggest thing is that unless you infected the beer, it more than likely tastes like crap because they are really young, what we call green. If that's the case, which it more likely is, all is not lost....leave your beer in a closet for a couple of weeks more and taste them again. 99% of the time your beer will magically be better. Because the beer has conditioned in the bottled, it's matured and the flavors have married, like how leftover chili or spaghetti sauce always taste better the next day.
Your beer should do the same.
If this isn't the case, then maybe if you went into detail about the recipe and your procedure we can get to the bottom of this.