Want to actually have some sober time

I have a habit of drinking a lot and using cocaine, I really want to break this habit. Sometimes partying feel optional and other times it feels like a need. I have been struggling with this for awhile now, I am twenty three and it feels silly at this age to say I want to get sober but I have been messing around with drugs since I was thirteen and I feel like at this point I am stuck in a cycle of using cocaine and alcohol that I would rather break sooner then later, this has been going for about four years. Just seeking some advice it feels like I don’t have enough discipline to hold down more than a week sober and my whole social scene feels enmeshed into my habit. Thanks