Hi Waffles, I'm 17 and in a similar situation to you...I've done all the quizzes but want to know more, but can't tell my parents etc.
I can't tell you if you are 'depressed' by definition but it comes in so many forms and is diferent for everyone
if you are feeling these things then something isnt right and you probably need help, even if it is just talking to someone for the moment...I've lately found just letting some of it out and sharing can really help even if it is to someone you dont know (actually I think that helps)
If you are after help this is a good place to be...everyone here is really nice and they are supportive and many have experience in these kinda things and will be glad to help you out however they can
hope you find what you are after here...pm me whenever you feel like it - even just to chat cos I'd luv to talk to you!
sc