I've Seen People And Heard People Say My Name

It first started when I saw a man standing on the side of the rd I was 15, I remember thinking oh my god we are going to hit him why isn\'t anyone moving? I saw him look right at me but when I looked back he was gone. So I asked my parents did you see that man? And they had no clue what I was talking about. I sometimes hear people say my name. Sometimes at work, which I work in a factory so when someone whispers your name there is no way you can hear them. And sometimes at my house. I have heard a lady screaming in my house, when I was a teenager... I heard a lady talking at my sons fathers house, which was weird because everyone was asleep and his mom only knows Spanish, so it wasn't any of them and recently I've seen a girl at my work my best friend recently died of suicide and work is where I was when she did it but the thing is this girl looks sad and it's not that I look at her for a long time and see her right in front of me it's like a glance and she's there then gone BUT! I always remember exactly what she looked like and what she was wearing. I'm a Christian so I was always thought not to play with this type of thing but I want to know and try to understand what is wrong with me. I feel crazy and it's making me really scared. I mean no one wants to think there's a ghost of demond around you or your child. I have never been one to want to watch things about ghost or Demond's so knowing that I might be seeing them makes me afraid to even be alone. Also when my friend died I felt really strong energy and we where really close.