So, they all always taste bad? If so, then it could be the nic level is too high and you are getting a bad taste. Or, it could be just your tastebuds being a bit wonky. Make sure you are drinking a lot of water, because vaping is very dehydrating and dehydration can mess with your taste sense, as well.
If they tasted good and then all of a sudden all taste bad, then you may be the victim of a really bad dry hit. A bad one can ruin your taste for days.
You could order some flavorless/bland eliquid in your preferred nic and ratios and try that for awhile. It's actually a pretty pleasant vape.