Aftermath

My older sister molested me multiple times throughout my youth and now later on in life I will have sex with almost anyone that I know. I don't feel guilt about doing so either but I know it's wrong. I can't remain faithful either when I'm in a situation that an opportunity to cheat comes up and when I'm not in a relationship I can't say no to people. Is this a coping mechanism to make what my sister did to me okay by making sex a hobbie/addiction? How do I stop?