Hi,
I resemble with you in some ways. I too like to play music and also create music. Im a guitarist, been in many bands, have gave couple hundreds live shows in my career.
My problems also started when I was young. Drinkinking during rehearsals, before and after shows. Over time it developed into every night drinking.
What I did was, I quit my drinking band. Formed a new band, with professionals. We treat our reversal and live time as a job. And a professional never drinks during job hours. We have a rule no drinking in reversals and before shows. If they decide to drink after I don't give a damn, I usually leave the venue after the gig.
My advice to you is, if you want to DJ, treat it professionally. Treat it like a job. Wheb you're set is done just leave.
Also, you could look into music production. There is tons to learn, and producing takes tons of time. Helps the get my mind off the booze for sure
Good luck!