I want to loose 19 pounds In 44 days? ?

A person your age shouldnt exactly be looking to lose weight like that, but if you're serious and whatever. Running is the single best way to lose weight. Lifting is not what you want to do. Cardio is the best way also. The right diet is important too. After a workout, eat some fruit. But remember, CARDIO! Active stuff, running, playing some ball, etc.