Some men are worth it, some are not. Some women are worth it, some are not.
When you have had a bad run of things it often seems like ALL the men/women might be that way.. but thats a distortion. Its all or nothing thinking. Which is not exactly true. There are wonderful men out there, and wonderful women, and you just have to keep looking and reevaluate the type you are going for if its not working for you.