Am i paranoid? schizophrenic? afriad? obbsessed with the supernatural?scared?

i always hear someone say something when its quiet so i say"did u say something"they always say no. i hear footsteps up and down my stairs when im home alone and my cats are always by me...its too big to be rats/mice. i always say 2 myself im just haunted. i fell as if i am. everywhere i go, i think someone is out to get me or someone is gonna jump out and kill me. i am obsessed with the belief of ghosts yet i feel this is unnatural. am i just super pessimistic? or am i schizophrenic, paranoid,insasne,crazy,our just over my head. HELP ME..ps this has been happening for over 2 years and i just realized this is not normal in the past month!