Question on under-age drinking? Does this seem immature to you?

I'm 16 years old. I'm not one of those people who get shitfaced every weekend, but i do party occasionally. I have a friend who's also 16 and she's always bitching and moaning about how bad alcohol is and how if you drink you're just trying to be "cool." Do you think she's being childish? I don't post statuses on facebook about being completely trashed or upload pictures or anything.