You sound so much like me!
I started off with my forehead absolutely covered in pimples. Then it moved to my chin, then later on spread to both my cheeks. I used to pick A LOT so now I have scars all over my cheeks and forehead. After trying all the store-bought acne cleansers (Clearasil, Proactive, all of those things), and failing them might I add, I kind of just gave up on my skin as well. I tried soooo many prescription medications from my doctor, and at one stage I was put on this certain cream that literally burnt my skin to the point where I had to stop because I thought my skin was beyond repair.
Acne treatment is all trial and error. My doctor used to say "So that one didn't work? Okay, lets try something with different ingredients." I've never tried the regime, but this site is FULL of success stories, and progress blogs that people on the regime have written. It's supposedly great stuff. If I was never put on Accutane, then I would be getting into it.
Failure is the first step to success, so don't be disheartened when something doesn't work. Don't worry, you aren't alone. I'm "the friend with acne" too, and pretty much every single person in my SCHOOL has clear skin, and it sucks. But don't let it bother you too much because one day your skin will be flawless, and they'll be the one getting pimples.
I have 100% faith in you that one day your skin will be clear. Keep up with your treatments, and one day you will find the one that works for you. Your dermatologist is the skin expert after all! I suggest you have a look around at some of the other peoples posts about the stuff you're on, and give it a go yourself.