How should i clear my mind?

okay. so, i'm on a vacation and i'm staying at my grandma's house. she lives like a mansion house. i see TV shows like people get killed, kidnapped, crazy stuff. now, i think that's going to happen to me. everytime i'm at my grandma's house. i'm just fightened and i feel something is going to happen. i have to stand by my grandma. my grandma is ssooooo young actually. anyways. everytime i step in the house i think i'm always scared. i don't even think about it. as i JUST step in the house, i get sooo fightened. how should i clear my mind?