How do I stop?

26F and I can finally admit that I have a problem. I started drinking at 14 and for as long as I remember I’ve taken it too far. I can never stop before getting sloppy and at best embarrassing myself and dealing with days of anxiety and at worst injuring myself and harming my relationships. I’ve told myself multiple times that I need to cut back, but clearly that’s not working. How do I actually stop? Every weekend that I tell myself I’m not drinking that weekend, I end up overdoing it. Seriously, where do I start?