My Dreams Comes True

This happens a lot of the time and my parents never believe me when I try to tell them about it. It usually happens about once every two or three months when I fall into a deep sleep and have a weird long dream that will last five days in the dream, and sometimes I fall asleep or take naps and it will go right back to where it left off. It took me a while to notice that after my dreams were over, I would forget about them until it comes true. For example, I had dream that we would have to go visit my grandma in Mexico because she was very sick and three months later my dad got a call from his sister telling him that our grandma was sick. At the hospital, everything looked familiar. The walls, the paintings, the rooms, the bed, the elevator, the broken stairs and even the doors. My grandma's door had a red line on the inside of it in the dream. When we got to the hospital there was a red line on the door and automatically the dream came rushing back to me. I asked one of the nurses and she told she doesn't know how that line got there because it's been there since she first started working there. I'm not sure if I can call this a coincidence or not. Should I be scared? I know that some of my dreams are weird and those are usually the ones that come true but I know people who have those types of dreams almost everyday and it's like they can predict the future. Is this what I'm experiencing? If so then how can I make this sense sharper? Please help. I'm not sure if this is a true psychic experience.