I know exactly what you mean and feel worthless too, I've been trying to trick my thoughts in a way, when I can remember I try telling myself over and over "i value myself, I'm proud of myself, I'm somebody, I love myself" though I dont really feel that way, I'm hoping one day my brain will pick it up and believe it if I keep thinking it. I have zero friends and zero family, mo romantic relationship and I'm an attractive woman in shape and my co workers treat me bad too, so do not think it has anything to do with how you look or dont look. Also, when people treat me bad I try to treat them good when a situation arrives, in Hope's they will see how crappy they were to me and change their behaviors. I'm sorry you feel the way you do but atleast you are not alone in the feeling.