In the chinese culture, those resident ghosts without guidance will remain in their existing realm. Cant really go for reborn cycle nor freed. This is a bit sad but that's the culture behind.

Yes, and in some religions they believe we never see those we loved on earth ever again.  Does that make it true?  NO!

In spirituality, you set your own beliefs, so you perceive the spirit realm (and the earth realm) as what you think it is.

Cool glad to know I'm not the only kiwi posting on this forum.

In druidic culture a death is celebrated as a birth in another world, and a birth is mourned as a death in another world.

Also souls need a lot of love to help them on their journey to the next world. Life only flow in one direction so to remain in the physical realm after death is to remain attached. Release is needed to move on. You are aware of these spirits as you are in a position to help them on there way. It's a big thing going from one world to the next and they need lots of love to be shared with them to help them on their way.

In Vancouver where I lived for the a long time, there is a lot of history of traumatic deaths and such. When a soul dies in a traumatic way or even with a peaceful death it can be hard to let go and release from this realm and make the journey the next, as traumatic death or relatives taking to it traumatically just makes it all the harder to go. In Vancouver it has just been swept under the rug, and as can be predicted it festers and becomes worse then dealing with it ever could be. A lingering soul may still want to experience flesh, and when one is under the influence of drugs or alcohol they are more susceptible to having a lingering soul enter their body and live in them. Ever heard of drunks saying they hear voices? So in Vancouver where it has been swept under the rug there are tons of problems from drugs and alcohol abuse. In other countries that have had worse history of slaughters and traumatic deaths but when it was over they held ceremonies and honored the dead not surprisingly they don't have nearly as bad problems with drugs and alcohol.

Anyways the morale being honor the dead and help them on their way to the next world and don't be afraid of them. It's like being afraid of your children. They unless their new souls went through the same process of going from one world to the next and then coming back to incarnate in the flash once more.

I dont want to start out with a rant about modern medicine and its inability to accept the spiritual plane being as real as the physical. So I wont, but i would like to say to you that there is nothing WRONG with the way you see things, even if others cant. It's true that your perception of things may be different, but no less real than any others. I wouldnt be surprised if your also a bit dyslexic. I know personally that there is a link between dyslexia and remote viewing and other unusual perceptions. There is nothing wrong with your brain or your ability to perceive things on a level most are cut off from by conditioning. We can not all be conditioned. That does leave you a bit vulnerable to the angst of the spirit realms, and misunderstanding humans thinking your crazy however, and i myself have wondered about a padded cell somewhere quite a time or two. It's a shame that your greatest defense is silence also, because everyone else just thinks your nuts. You're not.
 As for the "ghost" If its an intelligent apparition it may be seeking you out to make its transition or pass along information to you so it can move on, or just simply need your help in some way. If its a residual energy, just think of it as furniture thats occasionally there or not there and moves around freely, that's about its equivalent. Like an energy pattern just caught in a loop. These can be "switched off" usually with a good energy cleansing of the building and its property ( and any previously attached properties). An Intelligent haunting usually requires a bit more patience and work to understanding the communications. this is where different divination tools would be helpful to finding a solution. An Excellent book for using a Ouija for that assistance would be Ouija... It's Not Just a Game. I know it can be found online easily and it's under $10. It teaches you how to use a board safely and with protection to get better results without having a lot of spirits running a muck. In fact i think there is a link from the site listed in my profile if you wanted to look for it, but its a tool that should be used with great respect and proper handling. Pendulums and other tools could help answer questions about the spirit and if it will communicate with you. If i can be of any further help please let me know.