I'll enjoy it
I have one small piece of advice to make the forum seem a bit less cluttered. I think it would work well to separate the boards a bit. Perhaps something like this:
News
*Announcements
*Whatever else you want to put here
Intro/Goodbye but there doesn't need to be any subgroups
Video games (Because that's a big conversation starter on most teen forums and people like to be able to see the important parts of the forum easily)
*General/Computer
*Nintendo
*Sony
*Microsoft
Anime (Another big topic on teen forums but that's really your call)
Entertainment is fine the way it is, under general categories.
Forum games should be a category of itself but it doesn't really need any subgroups
There's also a few extras that you could add if you want that I've seen on some forums before.
*Politics
*Serious board
*Trends
This is all just a small suggestion though. How you run your forum is completely up to you.