I'm 19 as well. I've learnt that topical lotions do far more harm than good and they do not treat the cause of acne, only the symptoms.
There is a sure way to get rid of Acne without any damage to the body (in fact, you'll be so much healthier all over!). But it may seem quite radical. Is it worth the effort? Guess it depends how much you hate your Acne and how much you care for your body.