Hi Amanda. What a wonderful first cruise! Inside cabins are fine by me, especially with the busy itinerary you most likely have on that sailing. At first, the cabin will seem small to you, but humans are very adaptable, and after the first day the size will seem just right.
I really like Harry's idea of keeping the door open and closed at the same time. Once I had an inside cabin on a cross hallway with not too much traffic. Kept the door open during the day quite a bit. Having a drink before dinner, waiting for friends to drop by, etc.