Any time I have a weird or scary dream, it always take place in a house i once lived in when i was little. I lived in the house at the age of 5 -11 years old.

Would you consider that the house you grew up on? Most houses in dreams represent us, with the various rooms being different aspects of us. The basement, for example, being past issues, our "foundation" in life. the bedroom usually deals with sexuality and intmacy. The living room the things we show to the world. The attic is our higher self as well as hidden or repressed memories.

Why you keep going back there during the bad dreams.... dreammoods.com had this say about childhood:

"Childhood
To dream of your childhood, indicates your wish to return to a life where you had little responsibility and worries. It also represents innocence. Alternatively, it suggests that certain aspects of your childhood has not yet been integrated into your adult personality. Or on the other hand, some childhood anxiety has yet to be resolved in your adult life."

It makes me wonder....did something bad happen to you in that house? Or while you were living in that house? It may represent pain or scary things to you. Something could be happening in your current life that reminds you of being back there.

If the house was a pleasant place to live in, and you have pleasant memories of this place, then I'd take a guess that maybe you going therre during nightmares would be a defense mechanism, something that makes you feel safe or a place to remind you that you are safe.