gonna be a part of my brother's bachelor party in 2 days

I don't even know what the fuck I'm gonna do there, I'm gonna be the youngest person there (18, my bro's 30, like 5 people in total, none closer to my age iirc), I don't drink, I'm introverted as fuck, and I don't have a lot of interseting shit to say

it's either gonna be somewhat chill, or it's gonna be the most awkward 3 days of my life