Advice

There’s this party next weekend for everyone in my grade... because we’re nearing the end of high school and most of us are dropping out. But yeah so I’ve been invited but I’m not sure if I should go... I’m not really the social butterfly but I feel like I would regret it if I didn’t? Idk... i don’t even know if any of my friends are actually coming... idk I’m kinda nervous about it... cause like most likely everyone will be drinking alcohol and doing drugs... and without my friends there I might feel peer pressured into doing that... (which I don’t wanna do...) idk... I’m just kinda anxious about it... I’m sorry for my rant and everything... any advice is much appreciated, thanks in advance.