I am almost 16 and I have never encountered a ghost before until a couple of days ago. However it seems to only happens after I meditate. The first time it occurred was when I meditated for the first time and went to sleep straight after. Then at 5:30 in the morning I was woken up because it felt like there was someone at the entrance of my room. I thought it was my mum so I got up but when I reached the door, no one was there. At the time I didn't really think much of it and went back to sleep.
Later that day I meditated again. This time at 11 o'clock just as I entered the bathroom and turned on the lights, I heard a voice of an old man. The voice was very croaky and sounded like it was on the verge of death, but for some strange reason it felt like it wasn't coming from any direction. It said to me, "open the door." Can someone tell me what it meant by this? I am very scared of ghost, however when I heard the voice I remained very calm. I then thought it was just my mind playing tricks on me and so I simply ignored it. But because it sounded so real so I told some of my friends about it the next day. In the end most of them told me I was probably going crazy.
That night I did not meditate to see if meditating had to do anything with it. In the end nothing happened that night or early morning. So does this mean by meditating I can hear and feel the presence of ghosts? Or is it just a coincidence? Truthfully I am unsure if I should meditate again to confirm this as I get scared easily just thinking about seeing a ghost. Also should I listen to what the voice had told me and open this "door" that it spoke of? Please help and tell me what I should do or relieve me by telling me that I'm just going crazy.