Arnold ate clean, packed in the protein, and kept refined carbs to a minimum. He didn't have the luxury of taking the supplements that are available nowadays, so he made good nutrition his number one priority. You have no excuses. What are you hungrier for? Cheating is a temporary joy. Being a winner lasts a lifetime.
If you're sick of cottage cheese, have some egg whites. If you're sick of chicken, add some salmon to your diet. Play around with the types of veggies you eat. Eating clean means staying regimented with your diet, but doesn't have to be boring.