My great-grandmother was a practising witch, and some of her descendants (like myself) have what I like to refer to as "supernatural sensitivity." Naturally, I have seen spirits, and I have communicated with them. I also have psychic dreams.
What I need is to figure/find out a way to channel what I feel inside into something good. Also, I am a practising Christian and I'd like to find a way to devote whatever this is to God.
ANSWER - I get a lot of questions from people who are interested in the mechanics of magic and spirit work but it is rare to get a question that takes this to the next level relating to the morality of magic and whether or not we should do the things we can do. Your question strikes at the very heart of what it is to be a witch. If we have gifts - how can we use them to the best purpose..?
The abilities you have are intrinsically neither good nor bad. Think of it them as an additional sense. In the same way that sight can be used for good or bad purposes (for example you can choose to watch nasty things on the internet or you can choose to view uplifting positive images) your psychic gifts can be used for the pursuit of good or evil. What you can do is morally neutral, what you choose to do is influenced by your will and therefore the morality that you choose to impose.
I'm not a Christian myself but I have read a fair bit of Christian literature especially in relation to the Christian mystics who like yourself have spiritual gifts that they want to use for the pursuit of good. The mystics talk about offering their gifts to their Christian God - allowing God to work through them and channelling the spirit of Christ when they use these gifts. What this means, put simply, is that if you hold your God at the forefront of your mind when communicating with spirits or directing the energy within yourself into intent then you will perform no action that goes against the nature of the God you worship.
I'd say that if you truly want to use these gifts to serve the Christian God then it would be worth looking for practical ways to put them to some use. Psychic intuition could be a very useful gift for counselling. The magic involved in manipulating others could be put to excellent use in fund raising. Think about what you have the ability to do and then think about the needs of those around you and how you could use your gifts to put something back into the world. One of the core tenets of your faith is the commandment to love your neighbour. What better way of loving your neighbour than making the most of the gifts you have been given to help people in need?