Hello and welcome to EmpowHer,
There are many resources for treating sex addiction and I'm glad you are seeking help.
Below I have pasted a link to an article that described each kind of treatment for sex addiction. Please read all the information about each one.
I can also provide you with information about resources in your particular area if you wish to share your location.
Fortunately, you have already taking a great first step in breaking your addiction by refusing to have sex with girls. Eventually through therapy and rehabilitation you will learn how to have a healthy sexuality. It will allow you to rule your sexuality instead of it ruling you.
Let me know if you need more information.