I believe, No human being alive on this planet can answer this question.
It could be a YES or a NO. Any person who would say that they do exist or they don't exist, that would act as a meaningless answer without any valid proof.
Using the same knowledge that builds bridges, generates power and allows acrobatic artists, we know that ghosts do not exist. Unless you can show one example where energy is created from nothing, then you can't prove ghosts are real.
If you want more proof, take a course on physics.
ghosts are real coz I have seen ghosts a lot of times. My grandpa told me when I was a kid that I was different among the others coz I can see what other people can't but I wont get worried coz those things that only I can see wont hurt me
You may have something seriously wrong with your visual perception. Have you gone to a doctor?