Feeling like shit about my personality

Does anyone else have a problem not with their appearance (obviously sometimes I do, but everyone does) but with who they really are? I often feel like I treat everyone like shit and no matter how hard I try, I come off as a bitch or rude. I really don’t mean it but I feel like fucking slapping myself sometimes. I wish I knew when I was being this way because I’m often aware after I make these mistakes. Is this a confidence issue? Can’t figure it out:((