I don’t use drugs nor alcohol, but I just turned 18 and I noticed that a lot of people younger than me (high school age so 14-17 even) use alcohol and sometimes drugs from siblings, older friends, etc.
Did you do that when you were younger than me? I don’t plan on doing so anyway.
The minimum legal age for drinking beer or wine at a pub or restaurant is 16 years in Germany and many of its neighbouring countries so, yes, it’s not at all unusual around here to drink before turning 18.