Alcohol makes you feel relaxed but why do you need it? Isn’t it unhealthy?

Ever since I was little and told in school and from friends and family that drinking, smoking and drugs were bad for you and never do them! So I’ve lived by that rule my whole life never drinking, smoking or doing drugs. But I have a friend who says “Whats wrong with having a drink while watching a movie?” AMC Theaters serve alcoholic drinks at their bars. To me, I just find it odd like why the need to drink at all? I thought drinking was unhealthy and caused health issues. My friend says drinking helps relax the muscles and makes you feel relaxed. But why drink at all? I don’t get it.