What Is a Medium?

I was very young playing with my friend and I saw a blue ghost walk by my door. We call him the blue-cluck-cluck-chicken (Again, I was only about 7 when I saw him) When I was still in a crib, I used to talk to "the ceiling people", they were "a man and two nice women" which is how I described them. I live with my grandmother, and my uncle used to sleep in the same bedroom as I currently do. He was attacked by something he couldn't see, but the dog apparently could. It pressed on his chest. That happened to him three times and the last time, he karate chopped the window out of fear. Then we had his room (my current room) blessed with holy water, but it followed him to college once. He also saw a young army dressed boy in his closet. The same boy that I saw with "the ceiling people" as a toddler.

Someone once told me I was a medium, someone else told me I was a sensitive. What does that mean? I have no idea what I am. Probably just normal. Someone said something about it running in the family because of my uncle. Another person said it had to do with us both growing up in the same bedroom. So what does that mean?

Someone called me an "indigo child..." What the heck is that?

It comes very easy to me to feel what other people are feeling. Its so easy that I do it without noticing. Its easy to block it out whenever I want. Sometimes I'd just kind of stare at my friends eyes. Its weird, when I look into his eyes like that there is so much more than just a feeling.

What does it mean if I can FEEL a color. Did you know that pink is a heavier color than green? I thought that green would be tougher but it's actually lighter than pink.

Does all this mean I'm just insane? I've only found one person who believes me and he watches stuff like Ghost Hunters and Destination Truth and all that paranormal stuff.