Is one drink per night bad?

I just recently turned 21 and i’ve never been much of a drinker but I have a ton of stuff I want to try now that im 21 so every night before bed I make myself a new drink and I just chill and drink that. I haven’t really noticed any bad effects but I don’t want to be terribly unhealthy so that’s why i’m asking. The majority of the drinks are mixed with diluted whiskey.