Hmm. I'm 18, close enough?
Intensely quiet? - When I'm not with friends/people I'm more than neutral with, then yes. Also, when I'm working or thinking, yes.
Problems with being taken advantage of by jobs/bosses, girlfriends, etc? - Nope. I don't take s*** from people. I might not start a big issue out of it, I just get myself away from it, or find a way to remove the other person from it. (Tactics? Perhaps.)
Anger issues? - Yeah, but it's more of an internal thing. (I don't act on my anger.) However, I've had people tell me that when I'm angry/annoyed I somehow manage to put fear into them without saying or expressing anything, or even showing displeasure. Apparently I somehow manage to give off an "energy" that strong.
Whatever...I'd like to hear. - Lets see. I'd say life's decent. I've got a flexible, well-paying job as an engineering intern, drive out to ski twice a week once the snow starts coming, have a great girlfriend of two years who I get along perfectly with, plenty of good friends, and don't have much trouble with school, even with 4 math classes a day.
On the other hand, I struggle with (from what I can tell, having read a lot on the subject) some type of social anxiety disorder, and have depression issues as well, that take a lot out of me often.
What else are you looking for?