How do i get rid of my acne?

im 19, female, (i dont get why im getting acne now, i thought i was past puberty) and im getting it on my forehead and my cheeks, its not really bad but i dont want it to progress to that.my whole life ive never used any kind of products on my face, jus typical washing with soap, and ive never had any serious problems with acne/pimples, (jus mabe one or two) and now all of a sudden its breaking out, so ive started using st ives blemish/black head scrub, and clean and clear sensitive cleanser, ive been using it for about 1 week now and i wash in the morning and at night, and im not really seeing a big difference, is there anything i can use that would work better (preferably no products with salicylic acid, it breaks me out and drys my skin) also i wanna know if proactiv really works, jus the 3 step one, im really looking for products that will work quickly