I keep seeing things that aren't really there..what is wrong with me?

Need Exam: This could be many things of both a neurological and psychiatric nature and depends on what you are seeing, when it started, and other factors. Organic causes may need to be ruled out with an MRI and if these are hallucinations they can be caused by many conditions including depression, bipolar, schizophrenia, etc... Best to see a psychiatrist or neurologist asap so you can feel better.