It is going to be very difficult to succeed long-term unless you are willing to completely change your friends and surroundings which lead you to temptation.
It isn't going to be enough just go to the pub or hang out and simply not drink. This is a complete Life Reboot if you are committed to living clean and sober.
Also please be very careful with mixing coke and booze. Alcohol intensifies the toxicity of cocaine. I know two friends, brothers, who each suffered strokes from partying frequently with this combo. It is very dangerous stuff, and I hope you can finally step away, for your health.
Kind regards.