Spirits and Ghosts

Let's start this by saying, I've seen some ghosts. I don't know if it was showing it self willingly or not. Anyhow, I'm the only one that's seen ghosts in my house. And there are ghosts in the house, that's for sure. My stepfather has been disturbed while sleeping, items has been displaced, e.t.c.

First encounter:

I saw it floating, over to my room. I didn't see it so well, as it was more a blurry floating ball than a person, but the next time I saw it clearly.

Second encounter: I woke up, in my little room. Then I saw them, not in much detail but I could see that there was a woman in a white dress, with a girl, also in a white dress. They vanish as I watch them. They were there that moment, but not the next.

Comment: As I am the only one seeing them, maybe I'm a medium, maybe I'm sick. But, if the ghosts are real, then I have some good information. With the first encounter, the ghost went to my room, and second, they were in my room. But that was weeks between those encounters, it don't make sense, or does it? Maybe ghosts don't have the sense of time like living people do. Maybe they just like staring at people, or maybe i need to go and check my mental health?