It might be because you're younger than 18. I don't think they programmed in a Liberteen section, but the age segregation is still in effect.
Case in point, you can't access the Libertine forums, but anyone above 18 (red star) can't access the Liberteen forums for legal reasons and to prevent predators (not the fun Ahnold fighting ones) from going after younger members of the forum.
Maybe put in a request for having a separate age resume and see if the Admins incorporate it? Otherwise, you're kinda SOL.