Welcome to SR Dom.
I'm glad you're hear taking this first step. Like many have already said, telling your GF and parents is a personal decision. I would get into your therapist as soon as you can to discuss your addictions. You might consider an inpatient treatment. If that is not a possibility you could speak to your therapist about a good outpatient treatment.
SR has saved me for sure! I'm an alcoholic. Never did like any drugs I tried thank goodness, I always liked the alcohol "high" the best. Except, of course, for the blackouts, hangovers, fights, getting kicked out of bars, drunken phone calls, hurting loved ones, lying, hiding the bottles, missing work and throwing up. Other than that, it was great.
I'm proud of you for being here. Stay strong. Let your friend flush it all and keep your promise to call your cousin. Promises are hard to keep when you're going through this but important for your sobriety.
~doll