I need help right now to make a decision

I just got a Summer part time job and there's a Christmas dinner tomorrow night. I know basically no one except my friend who recommended I apply and the boss since I've only worked with the boss so far. I decided I wouldn't go as I'm new and only staying for the Summer, but my friend is begging me to go. She also told me that they will be going out for drinks after. I feel as if I'm standing in front of two roads. If I stay home, I will be anxiety free, happy and comfortable, but there will be a bit of regret. If I decide to go, I will be anxious (i'm already anxious thinking about it), feel like an imposter (do I even deserve to go? I've only worked about 3 shifts) and potentially stick out like a sore thumb. But I could also meet the team properly, have fun with my friend and become more comfortable with the people there as well as prove to myself that I can go out and 'have fun'. I genuinely don't know what to do. I feel anxiety before every shift, this will be even more intense as I'll have to be socialising for at least 3 or 4 hours. Please help me, please give me insight or any thoughts. I need to decide soon.