I dont wana go out?

when the exams are over. im in junior cert. i dont want ppl to think im weird but i seriously dont eanna go out that night. i would rather hang round at a friends house who s a year younger than me. What should i do.? everyone will be drinkin and i dont wanna let my parents down by drinkin. i will a have a tiny bit but i wont get pissed drunk . What do you thin k i should do?