How do I know if I am, different, like clairvoyant?

I was wondering because, I see, like flashes, if you will, of stuff and they happen. Like for instance, I'll think of a scene from a movie and it will be on the TV next time I check the guide. Or I get this feeling, it's a very scary feeling, I can't describe it. It's dreadful though, and I know it means death. I don't get it all the time but when I do I trust it. I felt it for about two weeks before the death of one of my guy friends. When I heard the news of what happened to him, I wasn't surprised or shocked, because I could feel it. If I want something enough, like an object or something, I can focus on it, and then I usually get it. It's very strange. I can see, I really don't like to call them ghost's, more like unhappy spirits, in my home. I can hear them as well. It's not in my head because I've really seen and heard them, and so has my dad who doesn't believe in them at all. I asked my grandma about it and told her what I meant by everything, sensing energies is something else I can do, she got very serious and told me that my aunt, who ped away at the age of 16, 9 years ago, could do the same things I can. With eerie accurancy, like me. My great grandma told me the same thing. They also said we do(and did) have witches in our family. I'm sure not bad ones, but they were there all the same. It's hard for me to keep friends though I am normal, no one seems to understand me. So I guess I'm also asking could I be a witch as well. I accidentally dyed my hair black trying to dye it brown, when I my sister saw me, she's overly preppy and annoying, said I looked like a witch. I'm not sure why, any other tiem I would have laughed it off. I looked good to everyone else. But I took great offense to it for some reason. Can anyone give me a little insight? Oh, and when I was born, I actually died, but the doctors were able to resesitate me and so here I am. and I'm 15