On-call position

Hi everyone. I'm a new grad who's been working as a RN since August, and I was hired for an on-call position. My question is this: since I was hired as on-call, should I feel guilty about going out of town when I'm not scheduled? I was working full-time on all shifts to orient to my new role. After my orientation was complete, I requested time off earlier this month to go on a two-week vacation and was granted that time. Now, for the month of December, I was placed on the schedule for nine 8-hour shifts, which I feel fine about. I wasn't expecting to be guaranteed that much work; I expected to be called in on short notice almost all the time. The last ten days of December I'm not scheduled. I would LOVE to fly back east and spend that last week with my boyfriend. My friends think, that since I'm not scheduled to work, I should be able to go do whatever I want with my free time. My parents think that maybe I should forget all about going out of town; I've been unavailable to be called into to work on short notice most of this month, and if I make myself unavailable, I'll eventually never get called in. But what do all of you think?