How the heck do I get rid of my acne?

Okayy, so I've used toothpaste, sugar, Zyporex (through dermatologist online), regular rubbing alcohol, witch hazel, ProActive, and several other types of acne care solutions.. I just can't seem to get rid of it. It'll start getting better, but then it will just go back to being horrible. I know I don't have the worst of acne, but it's pretty bad. I've also attempted eating much healthier, cutting out sodas and sweets, and all that junk.. but nothing seems to work. I've actually been considering laser skin surgery. I'm seventeen years old, female, if that helps anyone.. Also, I've already started getting a few scars from my blemishes.

Any advice??