Study week...

Currently, I'm having my study week.. First time having study week on Christmas and New Year.. The feeling was really bad.. Seeing people celebrating but I'm not.. But there are also people who are having study week like me and they seem like having fun not just for few hours but for days as they are going elsewhere.. This make me having a lot of QUESTION MARKsss in my mind..

Why they can have such activity but I do not allow myself to have one??
I'm too stress?? Too care?? Too stupid?? Too control of myself??
OR..
They are too free?? Don't bother?? Well prepared??