I started out by sneaking alcohol from my Dad's stuff when I was 15. It was one of many things that I did to keep the GID induced suicidal thoughts at bay. I had already dealt with them once when I was 10. I was able to chase them off. But, they came back a few years later. Then, it was as much drinking and drug use as I could do to keep from killing myself.
Once I turned 21, I became a fairly heavy drinker until I was around 26. By that point, I gave up the alcohol, but I was still doing drugs. Then, when I was around 34, 35, I picked up drinking again. But, this time, I could actually control my drinking and not get completely wasted all the time. I would only have a pint once or twice a month at the most. But, I had to give up the alcohol once and for all a couple of years later. I was suffering from severe panic attacks and the medications I am taking to keep them away do not play nice with alcohol.
So, now, it's no street drugs or alcohol for me. The prescription stuff doesn't get me high. It just gave me my life back.