I Can Feel Things Around Me And I'm Scared

My name is canny and I am confused on some things and i'm hoping someone can clarify a couple of things for me. I'm not sure if I may have a "psychic ability" or if its just dumb luck or coincidence. I feel stupid talking about it to other people because I have a hard time trying to make sense of it all, I have had several things happen to me so i'll start from the beginning. When I was little maybe 3-4 years old I would stay at my grandmother's house while my mom worked. My grandmother lives in a mobile home it's real nice and there is this hallway and everyday that I was there I felt something in the hallway. My chest felt heavy my heart would start pounding and I would just stare at this hallway. I felt like someone or something was there and my grandmother would ask me because I always just stared " Do you see something" and I said no because I didn't I just felt this thing there. My mother told me a story once and I remember parts of it but mostly the fear I felt that day, my mom told me that one day we were all at grandmother's my mom, dad and myself and again I was staring at this hallway but my mom said suddenly I just got up and ran right to my mom trying to hide and I have never felt so scared in my life it was so horrifying I didn't see anything but I felt it get closer to me this "thing" in the hallway and my mom was scared and asked me what happened did you see anything did you hear anything and I said no because I didn't I just felt this thing get stronger almost like it got closer to me. My chest was so heavy and I had fear running through my body. My grandmother and mother wanted to show me there was nothing to be afraid of because there is nothing there so one day they decided all three of us will walk down this hallway my grandmother in front of me and my mother behind me to protect me I guess and show me i'm okay. At the end of the hall was my grandmother room and we entered I felt okay but just uneasy and very uncomfortable, my grandmother looked under the bed and said look there is no one here you want to see for yourself and I said no and we went to the other side of the house and searched everywhere and there was nothing but I still felt uneasy and uncomfortable. I decided okay there is nothing here its just me and I went into my grandmothers room alone and I decided to look under the bed and I felt this thing again right behind me I felt if I turned around it was going to be right there so I screamed at the top of my lungs looking under the bed because I was too scared to run out and both grandmother and mother ran in and grabbed me both out of breathe they looked under the bed and asked what did you see and this time I didn't answer I didn't see anything so how can I prove i'm not crazy I can't explain these things and this kept going on throughout my whole life I can feel when these things are near I have had more experiences like in my dreams and I believe at one point in time I communicated with my boyfriends grandfather who is dead. I'm not sure what to do but I'm always terrified and I need someones help. If you want some more of my experiences let me know I have many other stories to help you help me.