IMO you should focus on the compound lifts and build your foundation up (i.e make some gainz).
However, I know that you will probably keep cutting (or trying to) regardless of what I say, so if you want an answer to your question:
It's likely because you feel too deprived when you aren't with your mates, then when you do spend time with them, you completely lose all self-control. Very common. Don't slash calories, eliminate any particular food, or do anything too extreme. Slowly drop kcals and do more cardio, and you will get leaner.
Again though, I think you'd be a fool not to make the most of this potentially highly anabolic period you're currently in.