How can I trust my parents not to freak out?
There are things you probably don't want to talk about with your parents; you feel more comfortable about talking about them with your friends.
But that doesn't mean you don't want to talk to your parents at all - even if you don't want them to know the exact details of everything you're doing.
Sometimes parents get the feeling that they're being shut out of your life when all you want is some privacy. They probably need a bit of reassurance at such times.