Having a Wiccan mother or parent, does not make you a wiccan, as well as having a christian parent does not make you a christian. Being wiccan is more than a family thing, it is a realigion and it shows from the heart.
The reason your spells might not be working, is because you are not doing them properly.
With a true need, respecting the magic you are doing, and taking into consideration your intentions (do you really believe sole heartedly in what you are doing?).