Hello My name is Jackie(jack for short) I am an 11 year old girl.

I don't know what I should do and I want to know what I can do abou it, When I was little I started seeing people and kids that always played with me and are still with me now... But  I can feel them but my parents say i am a phyco and one time I saw something slithering under my skin and it stopped moving I showed my mom and she said there is nothing there, another time I always smell the sent of fresh blood almost everytime I see my friends or mean people, I also started to have thoughts of killing my friends

Please if you know anything please send me a message, I dont know what to do anything, thanks:'(