I hate being me what causes it?

Many possibilities: There can be many causes. Most people "hate" certain aspects of themselves, whether it has to do with their appearance, or their life circumstances (job/relationship etc), even people that seem to "have it all" have some insecurities and things they hate about themselves. Depression can magnify those feelings, due to low levels of serotonin, so consider talking to your Dr or a therapist if needed.

Not sure: I don't know if you are depressed or overly self- critical. Don't know if you have recently experienced what you consider to be failures. Maybe you were given negative input by others. But, if you really do hate yourself, that is sad. We do have choices about this - consider seeing a therapist or a pastoral counselor.