How to get rid of acne for good?

I'm 16 (about to be 17) and I still have acne. Its nor like superbad, but I still feel self conscious about it. I tried proactiv and it worked, only when I used it constantly, but once I stop the acne came back really fast and worse off. I didn't have the money to buy proactiv every month so I just stopped it. Whenever I eat something sugary, mainly herbal tea with one tbs of sugar, I notice my face gets bumpy. Even if I don't eat something sugary, my acne is still there. How can I fix that problem?
How to get rid of acne for good?
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