When you write "it could ruin so much for me", that indicates you recognize an unacceptable level of risk associated with your sexual behavior. It sounds like you may have a drug dependency problem as well, but that's a separate issue.
The fact that you haven't been able to stop it on your own indicates some compulsivity. My advice for addressing compulsive sexual behavior is pretty standard, although it will be disappointing if you happen to be one of the many people seeking a quick and easy fix.
1. Soul-searching and willpower. Many people will be able to stop their unwanted behaviors with a big dose of honest self-examination and sincere effort. But others can't.
2. If that doesn't work, learn more about sexual addiction. A good book to start with is "Out of the Shadows" by Patrick Carnes. But there are others too. See if significant things in the book(s) apply to you.
3. Get outside help. Make an appointment with a therapist who's competent in sexual addiction. Join a 12-Step group. Do whatever it takes to get yourself healthy. There's no shame in asking for help; many people have done it before you and will be glad to assist you.
Recovering sex and pornography addict
The magic of asking for help is not in the help, but in the asking.