I'm going on a cruise on the 21st. I am sharing a room with my sister who will understand that I'm on my period. But my friend and her family are also going.My friend didn't get her period yet ( I don't know why, she is 13) and I don't want to keep going back to the room to change my pad. We are going to Bermuda and we will be getting off the ship. I can probably bring a draw sting bag or something. I'm not good at all at using tampons so I want to use them as less as possible. How could I swim? Or any way I can get it to start now so it won't come? Also, what if I go back to my room to change my pad and she wants to come with me? I don't want to tell her I'm on my period because she thinks periods are gross and stuff.