I have to go to the bathroom SOO bad...?

well, my family is pretty big. i have seven brothers and sisters. we all are on vacation visiting relatives for the holiday season. i was out late last night with some of my cousins and didnt get back to the hoouse until late...trying to avoid waking people up, becuase that can be chaotic, i didnt bother go into the bathroom to brush my teeth or use the bathroom. WELL i just woke up, and i am COMPLETELY regretting it!! i now have to go to the bathroom SOOO badly i can not even stand it! unfortunately, all of the bathrooms are taken, people are in line for the shower because today is supposed to be a busy day. also, im one of those people who hates to tell others when i am in this situation, so i dont want to tell them...but i need tips on how to "hold it" until i can go...PLEASE help soon!! thankss!!