C'mon bro there's nothing to worry about. You're 17!! just think in all the bright future you have building your body! I'm 31 and I'm the one who should be depressed. If I could be 17 again I'd be jumping of happiness all day long! Dude, the best years of your life are yet to come. If you feel depressed for something going in your life, share it with us! nothing is so bad as it looks. There's always a way for everything. If you just fell depressed without a valid reason, well motivate yourself with the same reasons I'm giving you. Workout, eat well, be good, study a lot. Respect your parents, be a good friend.