Okay, well my experience happened in 2004 during the summer in my aunts house. I was 13 at that time and my cousin, who is 2 years older than me, was going to hang out with me for the day while our mothers went shopping.
So her house is pretty big and they have a huge backyard. The kitchen is on one side of the house, then between that and the bedrooms is the massive living room. On one wall of the living room is this huge mirror that faces the balcony doors. So when you cross from the kitchen to the bedrooms, you have to cross between the mirror wall and balcony doors.
Anyway, it was a little bit past 8 pm--I remember thinking "I have to call my dad and wake him up" since my dad takes a nap during the day. My cousin and I had decided to watch dramas on her computer which was in the bedroom across the livingroom. She had gone into the bedroom and I had crossed the livingroom to the kitchen to get us some chips and drinks. I always got a weird feeling whenever I passed the living room area because it always looked like there were other people walking too (thanks to the mirror and balcony doors).
I had gotten the stuff and was walking back to the bedroom when, from the corner of my eye, I saw a little girl walking on my right side in the mirror. I remember almost every detail because I had stood there for a minute just trying to figure out whether I was seeing things or whether the mirror had been painted on. She wore a white night gown and was like 3 feet tall. I didn't see her face because she was facing forward with her head drooping down but she had blond hair in a bob style cut. I then looked down to my right side and she wasnt next to me. When I had looked up again, she was gone.
I was filled with such terror that I had started to have an anxiety attack. I dropped the chips and soda cans and ran to my cousin to tell her what I saw. She was shocked because she hadn't seen anything like this before but she was really concerned so she called our moms. I knew she believed me because my older relatives had many experiences with spirits so it wasn't that big of a deal to her.
After that incident, I had decided that I wouldn't go back to their house because I remembered what I saw in such vivid details that it would scare me again. My cousin had done some research during the few days after that, as well as asking the neighbors if they knew anything or anyone who lived in this area before they had moved in.
She told me that the grandma of the lady two doors down knew the family who lived there before them. My cousin found out that the previous family had a child daughter who had died from Acute Leukemia and they had moved shortly after. I was pretty shocked but sad too because maybe if that childs family had stayed living in the house a bit longer, they might've met her.
After that I decided to start visiting my cousins house again. I sometimes still see her in the mirror, although I don't know why it's only the mirror. It never happens to anyone else like this. However, I don't let it get to me like before..even though it still does creep me out even now.