As far as advice, I would definately recommend using accutane. Your doctor will conduct blood tests and make sure your liver function etc is still perfect.
As far as the deperssion, I never had any of it. Just make sure you keep active and do a lot of cardio vascular activity while your on it. Your muscles might be a little sore, but it will help to increase your endorphines. I boxed before and after accutane, but whilst on it, I simply did all the cardio workouts but stooped the actual sparring/boxing.
You might feel worse at first, because in the first stage of being on accutane, you outbreak FAR worse than ever before. But after about 6 months, nearly all your acne should be gone, and you will only be left with marks. Of which will clear up as time goes by (mine did nearly straight away, after I got really sunburnt of which gave me a mega tan). Although my skin has the ability to go very very dark anyways, which seemed to help cure it totally.
Acne, is probably the single most biggest confidence killer amongst teens in the world. Put yourself through accutane now (of which is really not that bad if you follow my advice), and you will feel like a new man in just 6 months time!