I am addicted to sex and constantly whacking off. I need help, how do I stop?

I was for a while meeting people locally trying to find girls to have sexual pleasure with. I have been whacking off every night for years now. I recently had a girlfriend but I lost her due to "cheating" that I was talking to another girl that I felt an emotional connection with but after we broke up, I didn't feel the connection. It was more for the thrill of it.I feel the sex addiction I have is destroying me and is getting me no where but hell. I know, deep down I can do better and go to college and get a good job and live a happy life. I have no motivation for it but sex and to find the "fix" that I can't get fixed. It makes me feel better after I "go" and I crave that. I want help and I want out of this scary place I am in. Any advice? Any help? I am seeking counseling but I missed my appointments due to my irresponsibility of sleeping in. I am tired of letting not only people down, but myself down. I am tired of feeling no good for myself and other people/family