I need advice on my new plan?

I am a frreshman in college and unlike most college students here, I've actually been opposite and lost weight. I exercise everyday and try my best to eat healthy, and I also keep no junk food in my room. Next week I am starting "my plan" to allow myself one "treat" on Fridays and Saturdays, but was wondering some tips to help me stay motivated during the week to not give in and eat any. I want to do this to help me control, as well as reward myself for making it through the week. I also currently keep a food/exercise journal.