At your age I wouldn't even worry about protein powders until you work on your nutrition.
This age group can make great improvements by simply adjusting their current nutritional intake.
As far as 1g/lb at your age, I wouldn't be too concerned with exact figures here, but again addressing the overall nutritional concerns.
What's your daily nutrition consist of now?
While protein powders typically come from real food sources, the fact is the supplement industry is not tightly regulated, so at the very least buy from a reputable company.