I don't use a firewall anymore, but i know Norton tries to make you think you are going to get a virus when it is about to expire, making it untrustworthy. I also recommend Comodo Firewall. It is i free and better than ZoneAlarm (which is a b*tch to uninstall...).

I am 15 as well. I don't really consider myself immature but I don't consider myself mature either. Anyway, a friend told me about this and when I got my 2 free doses, they both worked so I have been enjoying them ever since.