Is it right to hide things from our parents?

I don't think they need to know EVERYTHING but I think that when you're a teenager you should tell your parents if you're ually active so if you do wind up pregnant, it's not as huge of a shock for them and they don't lose all their trust in you and things like that. But if you're just sitting at your friends house drinking a little then I don't see why your parents would need to know.