My Vegetarian Challange

My challenge was to be a vegetarian for one week and I must say that it was hard for me. I went into this with a positive attitude but three days in I got really weary. I unfortunately failed my challenge, but am determined to do it again and succeed this time. I do not know what was hard about it, I just feel that maybe old habits die hard? I think one issue was that I like variety and the only thing that I had access to were garden burgers and vegetables. Other than that being a college student without a kitchen, I couldn't make tofurkey or anything of the sort. I mean for breakfast I would have cereal or oatmeal with fruit and that wasn't a problem. Even during the weekends I go for vegan sausage because they are more delicious than the regular sausage (plus the regular sausage contains pork which I can't eat).  Lunch for me was a bit of an issue but I got around the boring slump by changing my lunch between a garden-burger and peanut butter and jelly sandwiches, and a tasty elf parlor hummus sandwich. Dinner was my ultimate problem, what do I eat for protein? I know aramark has vegetarian options, but they have more of a non-vegetarian allure than a vegetarian one. What about the pizza you ask? I don't like the stuff, and even though there is plain cheese, there is pizza covered in bacon, chicken, and pepperoni right next to it. I did this challenge because I know a lot of people are passionate about their choice and I want to be open minded. I like to experience something and see things from other peoples point of view. As I said I failed this time around, but I am asking for feedback before I start this challenge over. How can I succeed with the vegetarian challenge and how can I keep my meals interesting?