How can I get clear, beautiful skin in a month?

I am 15 years old and I have really crappy skin. I have pimples on my chin and around my mouth, little bumps all over my forehead, red-purple blotches on my arms, and dry, scaly spots on my cheeks. How do I fix this? And preferrably in under a month. I wash my face every day, and I have tried different cleansers, including Clearasil, Neutrogena, Clean and Clear, even Proactiv! All they did was dry my skin up and and make it sensitive and red! I'm very fair-skinned so even the tinniest marks are visible, and I can't cover them up with makeup! HELP!