I have so much acne, and I've tried everything!?

And when I mean everything, I mean EVERYTHING. Proactiv, Skin ID, Clean & Clear, AcneFree, Neutrogena, Zapzyt, Sea Breeze, toothpaste, aspirin... you name it I've tried it. I'm working on Noxema now. Nothing I've tried has ever cleared anything up. I get acne on my face, shoulders, chest, and sometimes on my neck. I'm allergic to benzoyl peroxide, it makes me itch like crazy so that won't work. I'm nervous to ask my mom about a dermatologist because I think she'll say no, but I think I'm going to have to. I don't want to go into highschool looking like this. There has to be a way.