I feel for you. My son is 16 and occasionally wets his bed. He was on medication that helped a lot. Ask your parents to speak to your doctor about the medication.
Also remember to stop drinking a few hours before bed, it might be hard to do in the heat, but try to limit it and go to the bathroom before you go to sleep. Maybe there is someone who could discreetly wake you up a few hours after you fall asleep to go the bathroom.
Good luck