do you believe in ghosts

ok this is so weird i cant see ghosts but i can like feel if they are near me n stuff. in class the other day 2 pianos started playing by themselves but they were off it was weird n the other day i put my music book on the middle of my table i heard a bang i turned around n my book was on the ground opened n i was the only 1 in the house!!! i have this ghost in my house n he dosnt like me he like follows me arroud n always stares at me. someone help me and tell me what i should do.