How do you all manage your acne?

I've had acne-prone skin ever since I was a student and into adulthood. I've always taken care of my acne by treating it at home when it came up, but I regret not trying to prevent it in the first place. I've heard that acne is almost 80% influenced by diet and genetics, so I'm not sure if this will really help. I'm not confident that I can live my entire life without wheat or milk. How does everyone manage their acne? This is so annoying...