Not as good as I used to be....why?

Basically, I play for my local team and our season finished around the beginning of May, I then had exams to revise for and all of a sudden couldn't find time for juggling or just having a kick about with my mates. Now, I am a central defender, so passing doesn't have to be my strength but it was, I used to pass really well, anyway I started playing again yesterday, but now I feel uncomfortable and out of place when I have got the ball at my feet and lately whenever I get the ball I tend to loose my calm when it comes to passing and Ive started passing terribly......