Nice to see there are also others who have a mindset like that here. Also I'm around a college age so some people would consider me as a "weirdo" too, especially when Finnish culture is heavily alcohol-related
The legal drinking age is 18 for low-alcoholic drinks and 20 for stronger drinks over here. I've passed both the ages but never been drunk since I'm a teetotaller and have been during whole of my life (when I was younger, I sampled some very, very low-alcoholic ciders a bit but never got drunk and have given up those nowadays too).
That has never been a problem to my friends, no to these ones who drink and no to these ones who don't drink that much. I join them when they go to a club/bar sometimes since I love disco type dancing and seeing what kind of people I've around me. Tho I don't do that very often, perhaps 2-5 times within an year.
The reasons why I chose that way are pretty personal even I don't even recognize all of the reasons. For me, it is still nothing to do with my beliefs.