Tips for how to deal with period on a long flight, and camp as-well.?

so next saturday im flying from kl to syndey which is maybe 7/8 hours, and i havent gotten my period yet and im only 14 so how can i deal with periods on a flight and if i have pain aswell ( btw im traveling alone) also i have to go to a camp for five days and its in the winter so how can i deal with my periods forr sporting activities and stuff please helppp :(